Shooters reported at Washington's Navy Yard

U.S. Park Police and the Metropolitan Police Department are responding to reports of gunmen at the Navy Yard in Washington, D.C., WUSA9 reports. The buildings are on lockdown, and there are no known casualties. The U.S. Navy in a tweet confirmed the lockdown, but said, "No incident can be confirmed as of yet." WUSA9 adds that Navy Security is reporting two shooters, one white and one black male.

In 2013, gunman Aaron Alexis killed 12 at the Navy Yard. Across the nation, security has already been heightened ahead of potential threats during the July 4th weekend.

Update 10:05 a.m.: There is no evidence of a shooter at the Washington Navy Yard, according to the latest report from officials. The police department has declared the area "clear" and side streets have been reopened. The confusion began when a 911 caller allegedly told police he heard shots in Building 197 — the same building where gunman Aaron Alexis killed a dozen people in 2013, CNN reports.

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