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The U.S. flag at the White House is now flying at half-staff after calls for the flag there and at other federal locations be lowered to honor U.S. Capitol Police Officer Brian Sicknick.

House Speaker Nancy Pelosi had already ordered flags at the Capitol lowered to half-staff in Sicknick’s honor and calls were growing for President Donald Trump to do the same at the White House.

Sicknick joined the U.S. Capitol Police in 2008, serving until his death Thursday after being attacked as rioters seething over Trump’s election loss stormed the U.S. Capitol, believing the president’s false claims of a rigged election.

The Capitol Police said in a statement that Sicknick was injured “while physically engaging with protesters.”

During the struggle, Sicknick, 42, was hit in the head with a fire extinguisher, two law enforcement officials said. The officials could not discuss the ongoing investigation publicly and spoke to The Associated Press on condition of anonymity.