New York’s Attorney General is investigating the NYPD shooting death of a Brooklyn man, who was holding a curved metal pipe that looked like a gun, officials said.

Saheed Vassell, 34, whose family says he is bi-polar, was fatally shot by cops just before 5 p.m. Wednesday on the corner of Utica Avenue and Montgomery Street – steps away from his home in the Crown Heights section of Brooklyn.

“The Attorney General’s Special Investigations and Prosecutions Unit has opened an investigation into the death of Saheed Vassell, pursuant to the Attorney General’s authority under Executive Order No. 147. We’re committed to conducting an independent, comprehensive, and fair investigation,” Eric Schneiderman’s spokeswoman Amy Spitalnick said in a statement.

Police responded to the Wednesday scene after three different 911 callers reported a black man pointing a silver firearm at people on the street at around 4:40 p.m., authorities said.

When officers arrived at the street corner, they encountered Vassell, who matched the description provided by the 911 callers.

Vassell then “took a two-handed shooting stance and pointed an object at the approaching officers,” NYPD Chief of Department Terence Monahan said.

Four officers — two who were in uniform — opened fire, shooting off 10 rounds and striking Vassell several times, authorities said.

Medics rushed Vassell – a Jamaica native and father to a 16-year-old boy — to Kings County Hospital where he died.

The NYPD could not answer questions Thursday about whether the officers who shot Vassell gave commands before opening fire.

Executive Order No. 147 – issued by Gov. Andrew Cuomo in 2015 – appoints the attorney general as a special prosecutor to probe the deaths of unarmed civilians during interactions with police or where there is a “significant question” as to whether the person was armed and dangerous.

The attorney general’s office investigates any case that meets that criteria and has investigated 17 cases since the order was issued.