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JACKSONVILLE, Fla. -- An investigation is underway by the Jacksonville Sheriff's Office following a robbery Tuesday morning at the Jax Federal Credit Union on Dunn Avenue.

A male dressed in all black went into the bank at 9:45 a.m. and acted as if he was going to make a transaction, according to Lt. Derrick Lewis with the JSO robbery unit.

The suspect then pulled up a mask to cover his face, pointed a gun at a teller and demanded money.

The suspect then took the money and ran away.

He is described as a black male who is 30 to 40 years old, 180-210 lbs, 5'10"-5'11" who was armed with a black pistol.