Russell Hulstine, NewsOn6.com

UPDATE: Tulsa Police are looking for four men in connection with the robbery of the credit union. Police say all appear to be in their 20's. Only one shot was fired inside the credit union and not two as police reported earlier.

TULSA, Oklahoma -- Tulsa Police are looking for four men involved in a credit union armed robbery near Southwest Boulevard Friday morning.

Police say four black males, all wearing ski masks, entered the Tulsa Municipal Employees Federal Credit Union at 17th and Phoenix shortly after 11 a.m.

One of the men fired a handgun into the teller's glass partition. 

Tulsa Police say all four entered the vault area.  After a few minutes in the vault, they ran out and left in a green Jeep. 

Witnesses saw the Jeep drive into a nearby apartment complex where the four suspects got out and drove off in a gray or gold Honda Civic. 

Tulsa Police say the Jeep had been reported stolen. 

No one in the credit union was injured.

Police are not releasing surveillance video.

Tulsa Police say this robbery is similar to an armed robbery last Friday at an IBC Bank on September 9, 2011. 

Police say it is also similar to several pharmacy robberies in the city this year.