Eight days after Stephen Paddock shot nearly 500 people, killing at least 58 of them, investigators still don't have any answers to the big outstanding question: Why? Clark County Sheriff Joseph Lombardo told reporters on Monday that he is "frustrated" because "this individual purposefully hid his actions leading up to this event, and it is difficult for us to find answers for those actions." Discovering the motive is "our most important goal," he said.

But when pressed by reporters, Lombardo said there were some "minute changes" to the timeline, notably that Paddock shot Mandalay Bay security guard Jose Campos at 9:59 p.m., six minutes before open firing on the Route 91 Harvest Festival concert below, not at 10:18 p.m., three minutes after the shooting ended. He said Campos had responded to a door alarm on the 32nd floor, not Paddock's door, adding that he would not assume that wounding Campos sped up Paddock's mass shooting. Last week, Lombardo speculated that Campos' presence might have caused Paddock to stop shooting concertgoers. Investigators do not know why he stopped firing after 10 minutes, or when he shot himself.

Lombardo also said that the shooter fired at gas canisters near the concert venue, speculating that, combined with protective gear he had in his suite, he might have been planning to use exploding tanks and the resulting chaos and carnage as a diversion to make an escape. "We do not know whether he had planned to cause additional harm outside of what happened at Mandalay Bay," Lombardo said. "We do not believe there is one particular event in the suspect's life for us to key on. ... We believe he decided to take the lives he did and he had a very purposeful plan that he carried out." Peter Weber

Former Vice President Joe Biden spoke on the ongoing protests over the death of George Floyd in a Philadelphia address on Tuesday morning, blasting President Trump for his response and his Monday photo op in Washington.

Biden spoke from Philadelphia City Hall after another night of protests following Floyd's death in police custody last week, with the presumptive Democratic nominee calling the death a "wake-up call" and saying Floyd's words of "I can't breathe" are "echoing all across this nation."

"It's time to listen to those words, to try to understand them, to respond to them, respond with action," Biden said. "The country is crying out for leadership."

On Monday, law enforcement cleared out Lafayette Square of protesters using tear gas so Trump could walk to St. John's Episcopal Church for a photo op in which he held up the Bible, and Biden went after the president for this incident, saying it suggests he's "more interested in power than in principle."

"The president held up the Bible at St. John's church yesterday," Biden said. "I just wish he opened it once in a while instead of brandishing it. If he opened it, he could have learned something."

Biden also went after Trump for his tweet saying that "when the looting starts, the shooting starts," calling him "part of the problem." Biden added, though, "I wish I could say that hate began with Donald Trump and will end with him. It didn't, and it won't." Brendan Morrow

Wes Unseld, who starred for the NBA's Baltimore and Washington Bullets (now called the Wizards) between 1968 and 1981, died Tuesday, his family said. He was 74. The family's statement said Unseld died peacefully following lengthy health battles, most recently with pneumonia.

Unseld, who played center despite standing 6-foot-7, wasn't a prolific scorer, but he's widely regarded as one of the best defenders and passers ever to play his position and was a dominant rebounder, as well. He won the league MVP in 1969 when he was just a rookie, and helped the Bullets win the franchise's first and only championship in 1978, alongside fellow all-time great Elvin Hayes.

Unseld, who also enjoyed a standout career at the University of Louisville before entering the NBA and both coached and served as the general manager for the Bullets/Wizards for several season after he retired, was inducted into the Naismith Memorial Basketball Hall of Fame in 1988. Tim O'Donnell

Tensions between the United States and China continue to run high, and they likely won't simmer when Secretary of State Mike Pompeo meets with survivors of the Tiananmen Square massacre Tuesday afternoon.

In 1989, student-led demonstrations aiming for democratic reforms in China were held in Beijing before the government forcibly suppressed the movement. Pompeo extending a hand to the surviving participants certainly seems like a shot at the Chinese Communist Party, especially as it cracks down on a contemporary pro-democracy movement in Hong Kong. Earlier Tuesday, Pompeo blasted pro-Beijing authorities in Hong Kong for denying permission to hold a vigil in remembrance of the massacre for the first time in 30 years.

But some critics of the Trump administration think the secretary's gesture is hypocritical, since just a day earlier federal police used tear gas and flash grenades to disperse a peaceful protest against police brutality at Lafayette Square across from the White House so President Trump could pose for a photo-op in front of the historic St. John's Church, and police have clashed violently with demonstrators across the country over the last several days. Tim O'Donnell

President Trump has issued a very contradictory assessment of how protests in Washington, D.C., went down Monday night.

Protests against police brutality continued peacefully on Monday until the evening, when law enforcement began clearing the streets outside the White House so Trump could walk to St. John's Church across the street for a photo. Law enforcement fired tear gas and rubber bullets at the protesters, creating a surreal side-by-side as Trump spoke in the Rose Garden, but the president still maintained that there were "no problems in D.C. last night."

Trump's evaluation of Monday night's protest came in a Tuesday morning tweet, though he immediately reversed that "no problems" sentiment by bluntly stating there were "many arrests" in D.C. due to "overwhelming force" and "domination." Trump then thanked himself for what happened.

After a week of protests, Trump declared Monday evening that he was Americans' "president of law and order" and announced he would "deploy the United States military" to end violent protests in any city. Trump also announced he was "dispatching thousands and thousands of heavily armed soldiers, military personnel, and law enforcement officers" to halt protests in D.C. Kathryn Krawczyk

A group of civil rights leaders say they're "disappointed" and "stunned" following a meeting with Facebook CEO Mark Zuckerberg about his recent decisions on posts by President Trump.

Zuckerberg hosted a call with civil rights leaders on Monday as the company faces growing controversy and an employee walkout over its a hands-off approach to Trump's posts, including one in which he wrote "when the looting starts, the shooting starts" in reference to the Minneapolis protests over George Floyd's death. Facebook also didn't touch a post by Trump about mail-in voting that Twitter fact-checked.

After the meeting, leaders from The Leadership Conference on Civil and Human Rights, the NAACP Legal Defense and Educational Fund, and Color of Change released a statement blasting Zuckerberg, per Axios, saying they're "disappointed and stunned by Mark's incomprehensible explanations for allowing the Trump posts to remain up."

The civil rights leaders go on to say Zuckerberg "did not demonstrate understanding of historic or modern-day voter suppression and he refuses to acknowledge how Facebook is facilitating Trump's call for violence against protesters," adding his inaction on Trump's posts sets a "very dangerous precedent."

Color of Change President Rashad Robinson also spoke in an interview with Bloomberg News about the meeting, saying that "I spent a lot of time, and my colleagues spent a lot of time, explaining to him why these things are a problem, and I think he just very much lacks the ability to understand it."

Amid the controversy, Zuckerberg this week said he would donate $10 million to groups fighting for racial justice. But Robinson told Bloomberg, "saying Black Lives Matter, saying I'm going to give money, but having your policies actually hurt black people, people will know the difference." Brendan Morrow

People in China, where reporting on even small anti-government protests is censored, are getting full coverage of U.S. protesters and journalists being beaten and gassed by U.S. police, blinded by rubber bullets, and arrested in what looks like war zones. "Freedom is dead" in the U.S., Chinese wrote on social media, BBC News reports. "The U.S. police has lost all humanity." European Union foreign policy chief Josep Borrell said "like the people of the United States, we are shocked and appalled by the death of George Floyd," adding that Europeans "support the right to peaceful protest" and "call for a de-escalation of tensions."

Australians, meanwhile, watched a widely broadcast clip of 7NEWS reporter Amelia Brace and cameraman Tim Myers being clubbed, punched in the face, and battered by federal police clearing Lafayette Square of protesters so President Trump could walk to a church and hold up a Bible for the cameras. Australian Foreign Minister Marise Payne expressed "strong concerns" about the assault on the Australian journalists.

"We have asked the Australian embassy in Washington, D.C., to investigate this incident," Payne said Tuesday. "I want to get further advice on how we would go about registering Australia's strong concerns with the responsible local authorities in Washington," suggesting a formal complaint will follow. U.S. Ambassador Arthur B. Culvahouse Jr. tweeted in response: "We take mistreatment of journalists seriously, as do all who take democracy seriously." Peter Weber