The man being sought in connection with a mass shooting at a Harford County business park was sacked from another job earlier this year after attacking another employee, according to a restraining order filed against him earlier this year.
Officials said Prince, who has a criminal history, fled the scene in a black 2008 GMC Acadia with DE plates PC64273.
Deputies say they responded at 8:58 a.m. after a reported shooting at Advanced Granite Solutions in the 2100 block of Emmorton Park Road.
Three died at the scene and two were taken to a hospital.
The victims and the suspect worked for Advanced Granite Solutions, the owner of the company said.
"The 37-year-old suspect is considered armed and risky, police said, adding that they are searching for him".
If you see the suspect, police ask you to call 911.
Investigators believe Prince is associated with the business, but information on the exact relationship was not known immediately.
"If anyone sees the suspect, he's armed and risky", said Sheriff Jeffrey Gahler in a press conference, adding that authorities "don't believe others were involved". The suspect is believed to have fled in a black Chevrolet Arcadia with DE plates. In March 2015, he faced multiple gun charges, including being a felon in possession of a firearm. A former co-worker sought a restraining order against Prince in February, saying he had punched another employee and threatened employees.
He said one time, Prince came to see him, and cursed and yelled at him.
The Baltimore Sun reports Prince was sacked from another job earlier this year after he attacked a co-worker.
A number of Harford County Public Schools in the area are on a "modified lockdown".
Schools in the area, 30 miles from Baltimore, were placed on lockdown as police hunted for the gunman.