Police swarmed downtown Dallas Thursday after gunshots rang out following a protest and rally held over police shootings in other parts of the U.S. Two Dallas police officers were shot, an officer at the scene tells NBC 5, following witness reports that people were hit by gunfire. The extent of their injuries was not known. Police officials have not commented on the shooting. The shootings took place as a rally and march in downtown was ending. The rally was held to show solidarity with communities affected by officer-involved shootings this week in Louisiana and Minnesota. Scores of police officers arrived downtown following the shooting, which took place about 9 p.m. near Main and Market streets and a block from the Old Red Courthouse building. Officers could be seen taking cover as shots rang out. Video from the scene showed people running from the sound of the gunshots. There is no word on whether any civilians have been shot. At 10 p.m. NBC 5's Cory Smith reported that Dallas police believe they have a gunman confined to a building and are currently negotiating with that person. Well then.