Photo by Victoria Pickering

The lockdown at the U.S. Capitol has been lifted after staff and visitors were ordered to shelter in place amid police activity.

According several reports on Twitter, it appeared that someone brought a gun into the building.

We’re currently locked in the House chamber. Overheard a Capitol police officer say a woman entered Rayburn with a gun @CQnow

— Katherine Scott (@KatherineBScott) July 8, 2016

From sources: Woman in print dress was in Rayburn. Had backpack. Was going to Capitol thru underground subway when cops believes she had gun

— Chad Pergram (@ChadPergram) July 8, 2016

U.S. Capitol Police were addressing the situation, tweeted California Congressman Eric Swalwell, adding “God bless them and every officer across America who protects us.”

The Capitol Visitor Center was on lockdown as well.

Last summer, Congressional aide Peter James Boby was arrested when U.S. Capitol Police found a loaded .45 caliber handgun in his vehicle.

This post will be updated.