Two Milwaukee police officers were shot and have been critically injured after responding to a call for a person with a weapon late Thursday, police said.

In what is being described as an “ambush,” officers were fired upon as they approached an alley, according to police.

A 32-year-old officer has been hospitalized in critical condition while a 29 year-old officer hospitalized with a non-life threatening injury, police said.

Authorities are now searching for at least one suspect and are calling on that person to turn themselves in.