Some of the Texas Democrats who left the state in protest of a redistricting bill were temporarily evacuated Wednesday from their Chicago-area hotel after a bomb threat, according to police and lawmakers.

Four hundred people were evacuated from the hotel where they were staying, but they were allowed to eventually return.

Business in the Republican-dominated Texas House screeched to a halt in its third week of a special legislative session Monday when Democrats no-showed a critical vote on a GOP-driven plan to redraw congressional districts to further conservatives’ agenda in Washington.