A retired New York policeman was sentenced to 10 years in prison on Thursday for joining the violent January 6, 2021 assault on the U.S. Capitol, the stiffest punishment yet for those who took part in the riot.

Thomas Webster, 56, a former marine, earned the heavy punishment after having joined the uprising by supporters of then-president Donald Trump and attacking police officers guarding the Capitol with a flagpole, the Justice Department said.