An employee of a Timko Street business helped round up a Bridgeport man police said has been stealing bicycles from local train stations.

The employee called police shortly after 2 p.m. Tuesday after he spotted a man behind a building on Timko Street, abutting the Fairfield Metro train station, trying to steal a moped, according to the report.

The man, later identified as George Lopez, 54, of Fairfield Avenue in Bridgeport, was seen walking around the depot's bike rack. He pulled out a pair of pliers and tried to cut the moped's chain, but was interrupted when a train pulled in. In the meantime, police said Lopez sat on bench until the train pulled out and then stole the moped. He damaged the ignition apparently trying to get it started, police said.

Lopez was stopped by police as he walked over the station's bridge to Black Rock Turnpike. Identified as the theft suspect by the witness, he later also was seen on surveillance video of the incident.

Police said they also found two vandalized bike locks on the ground near the station's trash bin and a bolt-cutter in a trash can on the depot platform.

There were also two active warrants for Lopez's arrest, both for two other bike thefts from the downtown and Metro train stations. Westport police have outstanding warrants for Lopez for similar thefts.

He was charged with second-degree criminal trover and one count each of third-degree, fifth-degree and sixth-degree larceny. Lopez was held on bonds totaling $10,000 and is scheduled to appear May 15 at state Superior Court in Bridgeport.