AYER — A manhunt was launched in Ayer Sunday afternoon for the suspect in a bold daytime armed robbery of Archer’s Mobil at 70 Main St.

At approximately 3:30 p.m. a masked man, brandishing a knife, ordered the male clerk to hand over the register’s cash. The clerk ran out of the store, the suspect jumped the counter and emptied the register of its contents — approximately $200.

The clerk’s initial description was that the perpetrator was a clean-shaven white male with black hair, 25-30 years of age, wearing a red and darkly colored baseball cap and a black T-shirt.

He allegedly ran eastbound from the store cutting through Depot Square. Ayer, Shirley, Littleton and Massachusetts State Police responded, sparking a manhunt on foot.

A State Police K-9 unit simultaneously tracked the suspect in the general direction believed to be the man’s path of flight from clothing found behind a neighboring business.

The clothing located on the ground was a white T-shirt that the man allegedly used as a mask and a red and darkly colored hat.

Lt. Brian Gill of the Ayer Police Department says Officer Brian Cunningham and Detective Andrew Kularski are leading the information.

Those with information are encouraged to call the Ayer Police Department at 978-772-8200.