Capitol police are responding to an “active bomb threat investigation” after a man in a pickup truck threatened to detonate an explosive device near the Library of Congress in Washington DC.

A man appearing to be the suspect took to Facebook Live to stream a series of threats — and asking to speak to President Joe Biden.

“I’m trying to get Joe Biden on the phone. I’m parked up here on the sidewalk right beside all this pretty stuff,” said the man, identified on the Facebook page as Ray Roseberry.

“I’m telling you, them snipers come in, they start shooting this window out, this bomb’s going off,” he said.

Police said the suspect man drove the pickup truck onto the sidewalk before making his threats.

“The driver of the truck told the responding officer on the scene that he had a bomb and what appeared, the officer said, appeared to be a detonator in the man’s hand,” Capitol Police Chief Thomas Manger told reporters.

An evacuation of nearby buildings was ordered, and law enforcement and the Federal Bureau of Investigation were in negotiations with the man.

“We are in communication with the suspect,” Manger told reporters.

“We’re trying to get as much information as we can to find a way to peacefully resolve this,” the police chief added, while declining to identify the suspect or provide details about him.

“We don’t know what his motives are,” Manger added.

While it remained unclear whether the vehicle contains actual explosives, the Library of Congress’s main buildings were evacuated amid the scare, as was the nearby US Supreme Court and at least one of the three House office buildings.

The nearby Republican National Committee headquarters was also reportedly evacuated and the Washington Metro’s Capitol Hill subway station closed as a precaution.

A White House official said staff in the executive mansion where monitoring the situation and receiving updates from law enforcement.

In April a man crashed a car into barriers at the US Capitol, killing one Capitol Police officer before the attacker was shot and killed.