U.S. Park Police

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U.S. Park Police have an arrest warrant for 60-year-old Bernard Drai, who also goes by the last name of Derei. (U.S. Park Police/via WJLA NBC7)

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Members of the U.S. Park Police investigate at the site of a reported shooting near the National Mall in Washington on Tuesday, Aug. 4, 2015. (Associated Press)

U.S. Park Police ride horses past the Reflecting Pool at the Lincoln Memorial on the first day monuments reopen on the National Mall after the government shutdown, Washington, D.C., Thursday, October 17, 2013. (Andrew Harnik/The Washington Times)

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A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Alex Brandon)

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A U.S. Park Police officer stands watch before the start of the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke in front of the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013. (AP Photo/Charles Dharapak)

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A U.S. Park Police officer salutes as the United States Armed Forces Color Guard presents the colors at the National Pearl Harbor Remembrance Day ceremony Friday, Dec. 7, 2012 at the National World War II Memorial in Washington, D.C. (Barbara L. Salisbury/The Washington Times)

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Horse-mounted U.S. Park Police officers stand across G Street Northwest to block off the street in honor of the annual Blue Mass honoring law enforcement and public safety officials Tuesday, May 8, 2012 at St. Patrick's in the City in Northwest Washington, D.C. (Barbara L. Salisbury/The Washington Times)

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U.S. Park Police dressed in full riot gear hold back protesters during a raid on the Occupy encampment at McPherson Square, Washington, D.C., Saturday, Feb. 4, 2012. (Andrew Harnik/The Washington Times)

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U.S. Park Police officers take apart an Occupy sign during a raid on the encampment at McPherson Square, Washington, D.C., Saturday, Feb. 4, 2012. Police and protesters clashed throughout the day as tents and camping equipment were removed by park police and maintenance officials, some dressed in hazmat suits. (Andrew Harnik/The Washington Times)

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Allison Marman of Silver Spring visits her boyfriend, who has been living in McPherson Square, on Nov. 22, the day after U.S. Park Police arrested a person on charges of sexual assault and theft. (Andrew Harnik/The Washington Times)

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Actress Daryl Hannah is arrested Tuesday by U.S. Park Police near the White House during a protest against the proposed Keystone XL multistate oil pipeline. The pipeline would have a minimal environmental impact, the administration says. (Associated Press)

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Actress Daryl Hannah is arrested by U.S. Park Police in front of the White House on Aug. 30, 2011, during a protest against the Keystone oil pipeline. (Associated Press)

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A U.S. Park Police officer keeps watch as the rising water of the Potomac River floods the Georgetown waterfront Monday morning. (Rod Lamkey Jr./The Washington Times)