Retired firefighter Robert Sanford arrested for hitting three Capitol cops with FIRE EXTINGUISHER

A RETIRED firefighter was arrested for hitting three Capitol cops with a fire extinguisher in last week's riots.

Robert Sanford is facing three federal felony charges, including assaulting a police officer.

The retired firefighter, from Pennsylvania, was allegedly seen throwing an extinguisher at a police officer.

However, this was separate from the one that killed Officer Brian Sicknick, officials told the Wall Street Journal.

A photograph calling for a rioter's identification was released after footage emerged of the moment a protester hit an officer in the head with a fire extinguisher during Wednesday's protest.

It is unclear whether the man in the video is Robert Sanford.

The video shows droves of rioters storming past a barricade as US Capitol Police desperately try to keep them corralled on the west side of the building at about 2.30pm, the New York Post reports.

“They broke through, it’s on!” one man is heard yelling at the start of the clip.

Moments later, a rioter throws a fire extinguisher toward a group of officers below, striking one on the helmet.

It is unclear if the struck cop was Capitol Police Officer Brian Sicknick, 42 who, died on Thursday after reportedly being hit over the head during the riots.  An investigation into his death is ongoing.

Sicknick was reportedly bludgeoned with a fire extinguisher, according to The New York Times and The Associated Press, citing two law enforcement officials. 

A statement by the Capitol Police said he was injured and collapsed after returning to his office.

Four other people died during the dramatic siege, including a California woman shot by Capitol Police and three others who suffered medical emergencies.

At least 20 people have been charged in Washington DC's federal district court and another 40 have been charged in the local superior court since last week's riot.

Investigators are combing social media images that showed hundreds of people swarming the building, attacking police, stealing computers and artifacts and smashing windows.

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