A man set off a "works" bomb Thursday night in a courtyard at Huron View Apartments on Green Road in Ypsilanti, police said.
The man was inside an apartment building at 6:09 p.m., when he opened a door to the courtyard and threw a 2-liter bottle containing an unknown liquid outside, Det. Sgt. Troy Fulton said.
The bottle exploded, Fulton said, but no one was injured. A security guard reported the incident. So far, no one has been arrested.
Such bombs are often made by mixing Drano and foil in a bottle. Area law enforcement agencies have warned in the past that the bombs can cause burns or blindness.
Anyone with information can call police at (734) 483-9510.
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