MIAMI -

Miami police are looking for a group of armed men who robbed three Marathon gas stations in a span of 10 days. 

Two of the men entered a Marathon gas station March 21 about 3:30 a.m. One of them was masked and armed with a shotgun.

The men forced the cashier into the bathroom, tied the cashier up and took all the money from the register and a cellphone.

Two men entered another Marathon gas station about 3:50 a.m. Thursday. Again, one of them was armed. They rushed the cashier's work station and took all the money.

The third robbery happened Monday about 4 a.m. when two men entered a Marathon gas station at 3501 NW 22nd Ave. While one of the men posed as a customer, the other, masked and armed with a gun, entered the cashier's work station and demanded money. The man posing as a customer stood guard at the door and told a customer to leave, saying they were robbing the gas station.

While the robbers were leaving the station, they struck a woman outside who was pumping gas.

"We are worried that they are going to strike again," said Miami Police Sgt. Freddie Cruz. 

Police are describing the first robber as a white man, possible Hispanic, about 5 feet 7 inches to 5 feet 8 inches tall, weighing about 150-170 pounds. He is believed to be in his 20s and was seen wearing black pants, a black shirt, a mask and armed with a shotgun.

The second robber is described as a white man, possible Hispanic, about 5 feet 5 inches to 5 feet 6 inches, weighing 150 pounds. He is believed to be in his 20s and was seen wearing blue jeans and a striped shirt.

The third man police are looking for is described as a black man, who identified himself in one robbery as Jesus Castillo. He is 5 feet 5 inches tall, 170 pounds and was seen wearing a green polo shirt with blue jeans.

"Any time we have an armed robbery, it worries us. These individuals are armed with a shotgun and any moment they could take anyone's life," Cruz said. "Next time they strike, the consequences could be deadly."

Anyone with information is asked to call Miami police or Miami-Dade CrimeStoppers at 305-471-TiPS.