New York Attorney General Eric Schneiderman has launched an investigation into the Saheed Vassell shooting death by New York City police officers in Brooklyn on Wednesday.

Four NYPD officers confronted Vassell after receiving 911 calls about a man possibly holding a gun. It turns out Vassell, who is bipolar, was holding a pipe.

Police Chief Terence Monahan said that Vassell “took a two-handed shooting stance and pointed an object at the approaching officers.”

Vassell was killed after 10 rounds were discharged from the four officers.