Police are looking for a masked man who held up a convenience store and diner in Fairfield early Monday morning and then is also believed to have robbed a McDonald's in Bridgeport.

There was no weapon shown in either Fairfield incident, police said, nor was any threat made.

The suspected thief was described by police as a white or Hispanic man, about 5 feet, 5 inches tall, with a slender build and in his early- to mid-20s. He was wearing a black, hooded sweatshirt, black mask and black coat, police said.

The first incident happened just before 4 a.m. Monday at the Cumberland Farm on Kings Highway East where the man, after demanding money, was given a small amount of cash by a clerk, police said. The suspect then went to the Andros Diner at Villa Avenue and Tunxis Hill Road around 4:20 a.m., where he again demanded money. But as the manager walked to the register closest to the kitchen, the suspect fled on foot, empty-handed.

Police believe the man may be the same person who robbed the McDonald's restaurant at the corner of State Street and Fairfield Avenue in Bridgeport.

The incidents are under investigation.