OKLAHOMA CITY - Authorities have increased reward for information leading to the arrest of a man, who is believed to be responsible for four bank robberies in Oklahoma City in the last six months.

The Bank of Oklahoma and the Oklahoma Bankers Association are offering a combined reward of up to $10,000 for information leading to the arrest of the suspect in these robberies.

According to the FBI, the suspect has worn a different disguise in each of the robberies and is being dubbed the "Back Fence Bandit," because his escape has repeatedly involved scaling a fence behind the bank into a gated condominium complex.

On May 13, the Bank of Oklahoma located at 11300 N. May Avenue was robbed. In this robbery, the suspect wore a surgical cap, sunglasses, and appeared to have gauze and/or makeup on his face. The suspect stated he had a gun, although none was seen.

On July 15, the Bank of Oklahoma located at 11300 N. May was robbed a second time. In this robbery, the suspect wore a fake beard and dreadlocks, straw hat with small brim, and sunglasses. The suspect displayed a semi-automatic pistol in this robbery.

On September 27, the Bank of Oklahoma located at 2601 N. Meridian was robbed. In this robbery, the suspect wore an orange construction type safety vest, orange head covering, skull face mask and skeleton hand gloves.

Last Friday, November 29, the Bank of Oklahoma located at 11300 N. May was robbed for the third time. In this robbery, the suspect wore an old man mask (white with red lips) and a gray and white cap. The suspect displayed a silver semi-automatic pistol with black handle in this robbery.

The suspect is described as a black man, heavy build, 250 - 300 pounds, 5'10" - 6'2", believed to be in his 20's or 30's.

No one was injured in any of the robberies. However, authorities say the subject should be considered armed and dangerous.

Anyone with information is requested to contact the FBI at (405)-290-7770 (24 hour number). Callers may remain anonymous.