The man died after shooting himself on the west front of the Capitol building, which triggered a roughly two-hour lockdown, Capitol Police spokeswoman Kimberly Schneider said.

Members of law enforcement and emergency services gather and a parameter created around the west front of the U.S. Capitol as the U.S. Capitol is on lockdown, Saturday, April 11, 2015, in Washington. Police say the U.S. Capitol is on lockdown as a precaution after shots were fired in what appears to be an attempted suicide. Capitol Police spokeswoman Kimberly Schneider says the suspected shooter was “neutralized” after sustaining a self-inflicted gunshot wound. It’s unclear whether the man is dead. No one else is believed to be hurt. (AP Photo/Carolyn Kaster)
UPDATE 1:27 a.m. April 14, 2015: The Metropolitan Police Department has identified the man who killed himself on the Capitol grounds as Leo Thornton, 22, of Lincolnwood, Illinois.
Previous: 6:15 p.m. April 11, 2015
WASHINGTON (AP) — A precautionary lockdown of the U.S. Capitol was lifted after about two hours Saturday following a suicide by a man carrying a protest sign.
The man died after shooting himself on the west front of the Capitol building just after 1 p.m., Capitol Police spokeswoman Kimberly Schneider said. No one else was hurt.
Capitol Police Chief Kim Dine said the man had a backpack and a rolling suitcase, triggering an hours-long lockdown, and a sign that said something about “social justice.”
Robert Bishop of Annapolis, Maryland said he was biking near the steps of the Capitol when the suicide happened.
Bishop didn’t witness the suicide but said there were about 60 people in the area, and that some of them did, including a girl and her mother who immediately began crying afterward.
Bishop said another witness told him and a police officer that the man who killed himself held up a protest sign about taxation just before pulling the trigger.
No one was allowed to leave or enter the Capitol or the visitors’ center during the lockdown on a busy day for tourists, and some streets around the area were closed.
After being allowed to leave the Capitol, Bishop said he saw authorities taking clothes out of the suitcase the man had.
During the lockdown, about a dozen police cars, black SUVs and an ambulance congregated at the bottom of the west steps of the Capitol, which overlooks the bustling National Mall.
Police appeared to take measurements as bomb squad members searched the area. Nearer the mall, visitors gathered around trying to figure out what was going on.
The lockdown came during Washington’s annual Cherry Blossom Festival, which attracts thousands of tourists during Washington’s busy season.
Congress has been on spring recess for two weeks and lawmakers are set to return to work Monday.
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Associated Press photo editor Wayne Partlow and writers Amanda Lee Myers and Eric Tucker contributed to this report.