The FBI believes a robber nicknamed "The O2 Bandit" has held up three Denver, Colorado banks in the last month.
Investigators gave the man his nickname because he commits robberies wearing a medical mask and appears to be carrying a mobile oxygen (O2) tank with him. Investigators don't know if the tank is real.
Other than his medical gear, the robber's method is routine. He enters the banks, presents a note demanding money to the teller and then flees with the cash. The robber is described as a black man, 50 to 60 years of age who stands about 5-feet-8-inches to 6-feet tall and has a medium build.
Investigators believe The O2 Bandit has hit the following banks: Chase Bank, Denver at 11:39am on 7th Dec., Westerra Credit Union, Denver, at 9:30am on 13th Dec. and Partner Credit Union, Denver, at 3:45pm on 30th Dec. Bank robbery is punishable by a 20-year prison sentence for each offence.
There's a news video here.