TULSA, Oklahoma - Tulsa Police say they're investigating three robberies over a span of nearly two hours. No one has been arrested at this point.

All three robberies happened on different ends of town and police say they're thankful no one was hurt in any of them.

The first robbery was at A-Mart near 11th Street and Highway 169, where officers say a man wearing a cloth on part of his face came in, pointed a gun at the clerk and demanded money before running away.

Another one happened a short time later at the Clearwater Car Wash near 41st and Sheridan. The victim told News On 6 two men demanded his cell phone and keys.

Police say Walgreens near 15th and Lewis was also robbed by two men who made employees hand over money from three cash drawers. Officer Jeanne Pierce says robbery detectives are looking at surveillance video and talking with witnesses to figure out if any of the robberies are related.

"Sometimes, we can tell by mannerisms and the way that they hold the weapon or the way they talk to individuals whether or not they're the same people," said Pierce.

Call CrimeStoppers at (918) 596-COPS if you know anything that could help police.