NIAGARA FALLS, N.Y. — Police are now trying to determine whether or not three robberies at 7-11 stores in just as many days are connected.

Police say they're looking for two men who robbed the 7-11 at 2620 Niagara Street on Monday morning. One of the suspects had a gun.

Police say a man was armed with a large knife when he held up a store on Pine Avenue.

A third robbery took place Wednesday morning at 7-11 at 402 Niagara Street. Police don't have a surveillance photo of that suspect, but say he was armed with a sword and had an American flag bandana covering his face.

No one was injured in any of the robberies.

Anyone with information is asked to call Niagara Falls Police Detectives at 716-286-4553.