Suspicious death investigation outside Badlands nightclub in the Castro

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San Francisco police were investigating a suspicious death in the Castro district early Friday across the street from the popular Badlands nightclub.

Police haven't officially responded for comment, but KTVU witnesses homicide detectives on scene at the 400 block of 18th street. 

Police were called out on a report of a robbery in progress or fight and video taken at 2 a.m. shows several police agencies and a body on a stretcher. The coroner was also on scene.