APPLETON, Wis. — A firefighter responding to a medical emergency in Appleton, Wisconsin has been killed in a shooting that left three others injured. 

Authorities say the shooting happened after police and firefighters responded to a medical emergency around 5:30 p.m. in downtown Appleton. Officials have not yet identified the firefighter.

A police officer was also among those injured during the shooting Wednesday evening at Valley Transit. Police have not said whether anyone is in custody but insisted there is no ongoing threat to the community.

In a statement released Thursday on Twitter, Governor Tony Evers said he and his wife Kathy "send our deepest sympathies to the family, friends (and) colleagues of the firefighter who lost their life last night."

"We stand with our brave first responders ... as they mourn this loss," Evers said.

A procession was held overnight in Milwaukee as the firefighter's body was brought to the Milwaukee County Medical Examiner's Office. Firefighters lined the street as emergency vehicles escorted the body.

Appleton is about 120 miles north of Milwaukee.