MEXICO CITY (Reuters) - A lone, unarmed Mexican woman robbed a bank on Monday by handing over a threatening note to one of the cashiers, police said. "This is a robbery. Give the holder of this note all your money and don't risk your life. There are five of us, all armed, and we could hurt you," police said the note read. The middle-aged woman took 8,000 pesos ($1,000) before calmly walking out of the bank in front of the unsuspecting security guards. A bank is held up nearly every other day in the crime-ridden capital, usually by armed gangs. There were more than 100 bank robberies last year.