San Antonio police accidentally set a home on fire on the city's east side Tuesday night while trying to serve a search warrant.

Officers with the Repeat Offenders Unit and a SWAT team were in the midst of serving a narcotics warrant at a home in the 100 block of Belmont at around 9:30 p.m. when a "flash-bang" device used to distract people landed on a mattress and caught fire, police officials said.