Two killed in shooting at US sign company

Two people have been killed and at least three men critically wounded in a shooting at a sign company in Minneapolis in the US state of Minnesota.

Minneapolis police, local sheriff's deputies and police from nearby communities converged on the Accent Signage Systems after the shooting. Further details remain unknown.

The three injured men were said to be in a critical condition at the city's Hennepin County Medical Center, a spokeswoman said.