TULSA, Oklahoma - Police say four shots were fired during a robbery attempt of a Tulsa restaurant Tuesday evening. Police are searching for two men in connection with the shooting.

Officers responding to an alarm at Hungry Howie's Pizza in the 6700 block of East 81st Street got a call about shots fired while they were still en route.

Police said surveillance video showed two men enter the store just after 9:35 p.m. demanding cash. When one of the men was unable to get cash from the register, Police Sgt. Robert Rohloff said he fired two shots. One at the register and another one into the ceiling.

As the two men ran outside, the armed man turned around and fired two more shots through a window. Police say no one inside was injured, but Sgt. Rohloff says one employee was shaken up by the gunshots.

"A female that was inside there is pretty distraught. She was in there and shots are being fired from both inside and outside the business, so they weren't sure what these individuals were going to do," Rohloff said.

He says a search of the area by officers and their helicopter failed to turn up the suspects, who they believe now got into a vehicle and drove away.

Investigators continue to review the video in an effort to identify the suspects.