A day after the pro-Trump rioters breached the US Capitol building, two men became the first people to be hit with federal charges on Thursday for their actions, which lead to officers being injured and four deaths.

The men, identified as Christopher Alberts and Mark Jefferson Leffingwell, were both scheduled to appear in federal court in Washington, DC, Thursday afternoon, CNN reported.

Alberts, a resident of Maryland, was charged with a count of carrying or having access to firearms or ammunition on US Capitol Grounds, according to the complaint sworn by an officer with the Metropolitan Police Department, as per CNN inputs.

Alberts was wearing a bulletproof vest and wearing a backpack. After identifying a bulge on his right hip, Albert was approached by the MPD officer. “I immediately recognized to be a firearm,” the officer wrote in the document.

“At that point, I told two officers next to him that Alberts had a firearm on his person,” the officer wrote.

“Alberts, apparently hearing that, immediately tried to flee, but I was able to detain him with the help of two other officers.”

After he was apprehended, they found with a black Taurus G2C 9mm handgun and a magazine of ammunition.

As per the statement, Alberts had 25 rounds of ammunition on him. The officer also seized a gas mask, pocket-knife, first aid kit, and one military meal-ready-to-eat, or MRE.

Alberts told authorities after his arrest that “he was in possession of the firearm for personal protection and he did not intend on using the firearm to harm anyone.” 

The other person charged, Leffingwell, 51, faces three criminal counts and has not yet entered a plea.

During the push of to enter the Capitol building, Leffingwell allegedly attempted to push past a Capitol Police officer who was trying to blockade the building, then punched the officer, authorities said.

According to the officer, Daniel Amendola, Leffingwell punched him “repeatedly with a closed fist” in his police helmet and in the chest. The police then restrained him. Leffingwell later apologized to Amendola, according to a court filing.

The Capitol Police officer’s statement of facts released on Thursday also described the police reaction to the siege as the joint session of Congress was underway certifying the electoral vote of Joe Biden for president, when a crowd gathering outside that then broke into the Capitol building. 

“Members of the US Capitol Police attempted to maintain order and keep the crowd from entering the Capitol; however, shortly after 2:00 pm, individuals in the crowd forced entry into the US Capitol, including by breaking windows,” Amendola wrote.

The officer also described evacuating Congressional officials and Vice President Mike Pence. 

“In reacting to the crowd that had breached a window of the building, I moved to a hallway” on the Senate side of the Capitol, Amendola described. “While there, I attempted to form a barrier with other officers to stop or deter additional individuals from entering the Capitol building.”

The federal court proceedings for Capitol-related defendants are before Magistrate Judge Michael Harvey of the DC District Court and are ongoing now.

Police did not report where Leffingwell resides. He is currently being held in the central cellblock of the DC jail, according to his court proceeding. He’ll stay there overnight until he can be seen in court again Friday. Prosecutors say he might flee if released.

His attorney told the court that Leffingwell is a disabled veteran who suffers from memory loss.