Cromwell police are investigating a robbery at the Quality Inn Hotel just before 1 a.m. on Friday and believe the same person is behind hotel robberies in East Windsor and one in Massachusetts.
Police responded to 111 Berlin Road after receiving a 911 call reporting a robbery.
A masked man entered the hotel, implied he had a gun and demanded cash, police said.
The robber fled after the clerk handed over cash and got into a silver four-door car, police said.
Police detained a suspect and two passengers in his car in Windsor Locks this morning after received an alert from West Springfield police.
Anyone with information is asked to call the Cromwell Police Department at 860-635-2256.