BREAKING: At least one person shot, two police officers injured after suspect tries to ram car into U.S. Capitol complex

Update: 2:09 p.m. ET

Police sources said a suspect attempted to ram into a barrier at the U.S. Capitol complex on Friday, hitting and injuring two officers, NBC News reports. One of those officers is in critical condition.

According to multiple reports, the suspect branded a knife and was shot by police.

CrimeOnline will provide further updates when more information is available.

ORIGINAL STORY:

Washington D.C.’s Capitol Hill has been placed on lockdown due to an “external security threat.”

Multiple congressional reporters have said that U.S. Capitol staffers have been told there is no entry or exit to or from Congressional buildings as authorities investigate a security threat.

According to the Associated Press, police are investigating reports of shot fired nearby. Reporters on the scene have said on Twitter that a car appears to have smashed into a barrier. It is unclear if that vehicle is connected to the possible shooting.

Fox News reporter Jacquie Heinrich posted a video on Twitter of people being taken away on stretchers amid a large police and paramedic response.

PBS reporter Lisa Desjardins said on Twitter that staffers have been told to “seek cover.”

This is a developing story and all information is preliminary. CrimeOnline will provide further updates when more information is available.