Federal authorities have arrested and charged two men who allegedly assaulted U.S. Capitol Police Officer Brian Sicknick, who later died, with bear spray during the Jan 6. insurrection.

Julian Elie Khater, 32, of Pennsylvania, and George Pierre Tanios, 39 of Morgantown, West Virginia were arrested Sunday, according to court documents. They are scheduled to appear in federal court Monday.

Khater and Tanios were charged with nine counts including assault, civil disobedience, obstruction of a congressional proceeding, conspiracy to injure an officer, and violent entry and disorderly conduct. They face up to 20 years in prison.

It’s unclear whether exposure to the powerful chemical irritant led to Sicknick’s death, and neither Khater nor Tanios have been charged with it.

In addition to Sicknick, the men allegedly attacked a U.S. Capitol Police officer identified as C. Edwards and a D.C. police officer identified as B. Chapman with a deadly weapon. Nearly 140 law enforcement officers were injured during the insurrection. Sicknick was one of five people who died during the attacks; the other four were civilians. (Two police officers separately died by suicide after the insurrection.)

Prosecutors charged Khater and Tanios after receiving a tip identifying both men in footage of the attacks on the Capitol, the Washington Post reported. An affidavit states the two men were seen working together to spray officers with an unknown chemical irritant in the face and eyes.

“During the investigation, it is alleged that law enforcement discovered video that depicted Khater asking Tanios to ‘give me that bear s*it,’” according to court documents. “Tanios replied, ‘Hold on, hold on, not yet, not yet… it’s still early.’”

The video is said to show Khater waving his right arm up in the air from side to side with what appears to be a canister aimed at a line of police. The complaint says officers Sicknick, Edwards, and Chapman were seen in front of the police line bringing their hands to their faces, rushing to find relief and wash their eyes.

Sicknick, 42, was a 13-year veteran of the U.S. Capitol Police, and one of the department’s first responders deployed to the Capitol on Jan. 6. After he was assaulted, Sicknick returned to his division office before collapsing. He was taken to a nearby hospital and reported dead the next day.

Sicknick was honored at a memorial service inside the Capitol Rotunda on Feb. 3 — the fifth private citizen to receive the honor. The cause of his death is being investigated by the Metropolitan Police Department’s homicide branch, the Capitol Police, and the FBI’s Washington Field Office.

Spokespeople for MPD and USCP did not immediately respond to DCist’s request for comment.