A gunman opened fire at an office park in Maryland in a “targeted attack” on his co-workers, killing three of them and wounded two others Wednesday, authorities said.

The shooter, identified by police as 37-year-old Radee Labeeb Prince, carried out the 8:58 a.m. shooting with a handgun at a granite supplier store called Advanced Granite Solutions in Edgewood — more than 20 miles from Baltimore, cops said.

All five victims and the gunman were employees of the granite store in the Emmorton Business Park.

The victims’ identities were not immediately released.

“This does appear to be a targeted attack on that business,” Harford County Sheriff Jeffrey Gahler said at a press conference.

Following the bloodbath, police say Prince fled the scene in a 2008 black Chevy Acadia with Delaware license plates – and authorities are still looking for him, according to authorities.

He traveled to Wilmington, Delaware, after the shooting and was believed to have been involved in another shooting in that area, authorities said. There were no immediate reports of injuries in that case.

Prince has family in Wilmington, the cops there said.

Gahler noted that Prince, who he said does have a “criminal history” without providing details, should be considered “armed and dangerous.”

“We don’t want anyone to take action on him. We want you to dial 911 and let us know,” Gahler said.

The two wounded victims were listed in critical condition, according to the R Adams Cowley Shock Trauma Center in Baltimore.

At a later press conference, Gahler asked that the shooter turn himself in.

“He is a danger to anyone he encounters,” Gahler said.

Police did not immediately give a motive for the shooting.

Barak Caba, the owner of a home improvement company in the business park, told the Associated Press that Prince had worked there for four months as a machine operator.

The shooting is being treated as a case of workplace violence and not terrorism, officials said.

Area schools were placed on lockdown as authorities conducted manhunt for Prince.

The FBI was assisting local authorities to track him down.

With Post wires