Shooter kills 4, then himself at Minnesota business

(CNN) - A man opened fire Thursday at a Minneapolis business, killing at least four people before killing himself, police said.

The incident occurred about 4:30 p.m. (5:30 p.m. ET) at Accent Signage Systems in the Bryn Mawr neighborhood, said Sgt. Steven McCarty of the Minneapolis Police Department.

"I can confirm that the shooter is dead," Deputy Chief Kris Arneson told reporters. "And he died by a gunshot wound -- self-inflicted."

Raymond Thomas "R.T." Rybak Jr. said that he visited the business about a month ago and that it was rapidly expanding around the world "because they have such cutting-edge technologies."

In a statement, Gov. Mark Dayton said he deplored the "senseless" shooting. "There is no place for it anywhere in Minnesota," he said.