Two men were arrested and charged with assaulting U.S. Capitol Police officer Brian Sicknick, who died following the Jan. 6 riot at the Capitol.

Julian Elie Khater of Pennsylvania and George Pierre Tanios of West Virginia were both arrested on Sunday, according to court documents. They both face nine counts related to the Capitol attack, including assaulting Officer Brian Sicknick with a chemical irritant.

Questions still remain about Sicknick’s death and federal prosecutors have not alleged the two men are responsible.

Khater and Tanios face a maximum of 20 years in prison for the assault on an officer with a deadly weapon charge. It’s unclear if they are represented by attorneys.