https://www.justice.gov/usao-co/pr/us-attorney-jason-dunn-recognizes-law-enforcement-appreciation-day-january-9-2021-1

There was a photo or video of someone holding a fire extinguisher ..

"The department did not elaborate on the injuries he suffered, but two law enforcement officials said he was hit with a fire extinguisher as rioters stormed through the halls of Congress and lawmakers hid beneath their desks, The New York Times reported.

Officer Sicknick was rushed to a local hospital, where his family learned he had a blood clot on his brain and had been placed on a ventilator, his brother, Craig Sicknick, told the Daily Beast.

https://policetribune.com/hero-down-u-s-capitol-police-officer-brian-sicknick-dies-after-attack-at-capitol-riot/