A carbon monoxide leak prompted an evacuation Tuesday night of a downtown Madison restaurant, according to a news release. The Madison Fire Department said a crew responded at 10:26 p.m. to Zandru's Tapas Bar at 419 State Street on a report of a CO leak in the basement. Everyone inside had already evacuated when firefighters arrived. MGE was also at the scene inspecting the gas water heaters and gas boilers that serve the business and the apartments above the restaurant, according to the news release.