A San Diego-area Wells Fargo bank was robbed twice on the same day — by two different robbers, according to the FBI.

The thieves, nicknamed "The Hard Hat Bandit" and "The Chatty Bandit" by federal agents, held up the La Mesa, Calif., branch about three hours apart, said FBI spokeswoman April Langwell.

"The Chatty Bandit," wanted in at least nine bank robberies since March, strolled into the bank about 3 p.m. Monday, brandishing a handgun and demanding cash.

Three hours later, the Wells Fargo was hit again when "The Hard Hat Bandit" — who has struck three times in the past week alone — walked in with a note ordering employees to give him money.

Neither thief has been arrested.

"Chatty" is a black male between the ages of 20 and 30 who is 6 feet, 1 inch tall and weighs roughly 170 pounds, Langwell told the San Diego Union-Tribune.

"Hard Hat," who wore his characteristic construction head gear, is said to be a white male in his mid-20s who is about 6 feet, 2 inches tall and of thin, lanky build, the paper said.

Those with any information are asked to call the FBI in San Diego.

Click here for surveillance photos and more from the Union-Tribune.

The Associated Press contributed to this report.