Who's behind the Boston Marathon bombings? 4 theories

More than half a day after the explosions in Boston, police still have few answers. That hasn't quieted the speculation

Massachusetts State Police guard an area near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15.
(Image credit: Alex Trautwig/Getty Images)

Law enforcement officials don't have any official suspects in Monday's twin bombings at the finish line of the Boston marathon. And President Obama specifically urged people not to speculate on who's behind the attack, which killed at least three people, including an 8-year-old boy, and wounded more than 100 others, including several amputations.

"We still don't know who did this or why," Obama said Monday night. "People should not jump to conclusions before we have all the facts. But make no mistake. We will get to the bottom of this. We will find out who did this. We will find out why they did this. Any individual or responsible groups will feel the full weight of justice."

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Peter Weber, The Week US

Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.