The NYPD was put on alert Monday amid a multistate manhunt for the gunman accused of fatally shooting a Cleveland grandfather and then posting footage of the slaying on Facebook.

“Steven Stephens … is the suspect in a broadcasted murder that occurred in Cleveland, Ohio on April 16, 2017,” reads a flier distributed to NYPD officers. “Stephens is known to be armed and dangerous.

“He is believed to responsible for at least one murder, but claimed responsibility for multiple more that are unconfirmed.”

Residents in five states, including New York, have been told to look out for Stephens.