Police say that they have surveillance video of a man behind a recent string of robberies.

In the latest incident Tuesday, police say a man entered a Dunkin' Donuts on North Jerusalem Road in East Meadow, withdrew a kitchen knife and demanded an employee open the store's cash register.

Five Dunkin' Donuts shops and a 7-Eleven were also robbed within the past week. Police say that in each incident, the suspect was wearing a mask and made off with undisclosed amounts of money.

The first robbery happened at a Dunkin' Donuts in New Hyde Park, followed by two robberies in Plainview, one in Old Bethpage and one in East Meadow.

Police say the suspect is roughly 6 feet tall, about 25 to 30 years old and had a bandana covering his face. They also say he's dangerous and aggressive. In one robbery, he pressed the knife against a female employee's torso.

No one was hurt in any of the robberies, and police are still looking for the suspect.

Anyone with information is asked to call Crime Stoppers at 800-244-TIPS.