The United States Capitol has been placed on lockdown and all personnel in House office buildings have been asked to shelter in place as police investigate a possible active-shooter situation.

It is still unclear exactly what happened, and police have not issued any further information as of 2:45 p.m. EST, but it appears that several gunshots were fired just outside the building.

tweeted the following from where she is at the Capitol:

The following advisory was sent to all Capitol workers:

SHELTER IN PLACE. Gunshots have been reported on Capitol Hill requiring all occupants in all House Office Buildings to shelter in place. Close, lock and stay away from external doors and windows. Take annunciators, Go Kits and escape hoods; and move to the innermost part of the office away from external doors or windows. If you are not in your office, take shelter in the nearest office, check in with your OEC and wait for USCP to clear the incident. No one will be permitted to enter or exit the building until directed by USCP. All staff should monitor the situation. Further information will be provided as it becomes available.

We will update this post as any new information is released.

[CNN, Kate Nocera]
The United States Capital Building is on lockdown after reports of shots being fired near the Chamber.

Earlier Post:

NBC News reports the house went into recess after the initial report. A Capital Police officer is reported to be injured.

The Associated Press is reporting similar details via Twitter:

 This is a breaking story. Check back for new details.