The FBI published a photo and offered a $ 50,000 reward to find suspects taking advantage of the riot at the US congressional house to place tube bombs.

The picture, released by the FBI's Washington office on the evening of January 7, showed the suspect was a man wearing a mask, hooded sweatshirts, and gloves.

The FBI will award $ 50,000 to those who provide information leading to the identification, arrest and prosecution of those responsible for the incident.

A law enforcement source said the two bombs could both explode and cause "enormous damage" to the safety of the people if activated.

The FBI said it is also collecting clues and video footage of the riots and asking the public to help identify individuals inciting violence in Washington, DC.

At least 5 people were killed after hundreds of supporters of President Trump swept into Capitol Hill on Jan. 6 to protest against the US Congress to confirm the election results with the victory belonged to Joe Biden.

Dozens of people have been arrested on charges of carrying unlicensed guns, possessing prohibited weapons, violating the city's curfew and trespassing.

In a video posted to his Twitter account on the evening of Jan. 7, US President Donald Trump accused protesters of entering Capitol Hill "defiling the seat of American democracy" and warning them "to pay.

Trump also stated that he "immediately deployed the National Guard" to resolve the chaos, ensuring security, though many media reported that it was Vice President Mike Pence who contacted the Guardians.

White House press secretary Kayleigh McEnany on Jan. 7 told a reporter that the President condemned the violence of Capitol Hill with "the strongest words possible".