Several people are feared killed after a gunman opened fire at a Minneapolis business house Thursday evening, police said. The police had initially said at least two people were killed and four wounded in the shooting.

At least three people with critical injuries were treated at the Hennepin County Medical Center and police forces confirmed that the shooter was found dead with a self-inflicted wound inside the Accent Signage Systems building were the shooting happened.

“We do have several victims inside that are dead,” Deputy Chief Kris Arneson of the Minneapolis police said in an evening news conference outside the office of the company where the shooting took place, Accent Signage Systems, AP reported.

Arneson refused to specify the number of fatalities or the details of the victims, saying the police were still investigating.

Officers reportedly received a call on 911 around 4.30 p.m. reporting about the shooting in the business. The police have surrounded the building.

“We heard about four to five gunshots,” said Marques Jones, 18, of Minneapolis who was outside the building during the shooting and heard the gunshots. “We were shocked at what happened, and we just looked at each other. We all just took off running to our vehicles,” he added, according to an AP report. 

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