Two days after a shocking insurrection took over the U.S. Capitol, House Speaker Nancy Pelosi has ordered the building's flags be flown at half-staff in honor of Capitol Police Officer Brian Sicknick, who died after being injured in the mayhem.

"On behalf of the House of Representatives, I send our deepest condolences to the family and loved ones of Officer Brian Sicknick, who died following the assault on the Capitol complex and protecting those who serve and work here," Pelosi said on Friday.

Sicknick, 42, was a military veteran who served in the Capitol Police for 12 years, according to Rep. Don Beyer's office. Sicknick lived in Beyer's district in Virginia.

Sicknick's death Thursday night is being investigated by federal agencies and the homicide branch of Washington's Metropolitan Police. Capitol Police say the officer was "injured while physically engaging with protesters" and collapsed after making it back to his division office.

"He was taken to a local hospital where he succumbed to his injuries," the agency said.

Multiple law enforcement agencies are trying to find people involved in the incidents of Wednesday and early Thursday — including the discovery of two pipe bombs in the nation's capital. The FBI is offering a reward of up to $50,000 for information about who placed the bombs in Washington.