GALVESTON, Texas -

Galveston police said they've nabbed a trio of men suspected in several robberies.

Around 6 p.m. on Thursday, police said a hold-up alarm was activated at the T-Mobile store in the 2300 bock of 61st. Street in Galveston. The store was under surveillance by ADT security, and investigators said an official with the company told police there was a man wearing all black with a red bandana covering his face in the store with a gun.

Police later spotted a silver Oldsmobile speeding down Heards Lane from 59th Street. Investigators said that car matched the description of a car used in several other robberies in the past few days.

Police said they pulled the car over and arrested Erick Brazier, 18, and Aaron King, 20. A search of the car turned up merchandise taken from the T-Mobile store, along with a BB gun that looked like a semi-automatic handgun, investigators said.

The pair was linked to robbing a Shell Station on Sep. 3 in the 500 block of Ferry Road, and a One Stop Convenience store in the 1900 block of 45th, detectives said.

Investigators said they later identified a third suspect, Larry Bivens, 21. He was shortly after the  robbery at One Stop.

Police said King and Brazier admitted to the robberies, telling police that King would enter the store wearing the red bandana over his face and brandishing the gun. Officials said Brazier would be waiting in a nearby getaway car.

All three suspects have been charged with aggravated robbery.