Investigators say this man, one of the "Market Duo Bandits," helped robbed four banks in less than two months.

Investigators say this man, one of the "Market Duo Bandits," helped robbed four banks in less than two months. (KTLA-TV)

ORANGE COUNTY, Calif. (KTLA) -- Two men have been very busy in Orange County, robbing four banks in two months, and sheriff's investigators are seeking the public's help tracking them down.

Orange County Sheriff's officials say the two robbers have used the same methods in all four robberies.

Each time, the "Market Duo Bandits" have hit banks located inside supermarkets.

The men usually wear hooded sweatshirts, baseball hats and dark glasses, according to police.

In each of the robberies, they calmly approach the teller window inside the supermarket and hand the teller a note, demanding cash.

"Basically (the notes say),'This is a robbery, give me all your money,'" said sheriff's detective Jeff Brown.

As one robber passes the note, the other stands behind him, visibly keeping one hand inside of a bag, as if he's concealing a handgun.

The note-passing robber then refers to the other man saying, "Give me the money or someone will get hurt," Brown said.

The two robbers then walk calmly out of the supermarket.

They detonate the ink pack found inside the bag of cash and toss it into the bushes as they run to their getaway vehicle, a black Ford truck.

The most recent robbery happened nine days ago at a Ralph's supermarket in Lake Forest.

The pair is also accused of targeting banks in Placentia, Seal Beach and La Habra.

The men tried to conceal their identities, but they have been captured on surveillance cameras during their heists.

Officials have released the surveillance footage in hopes someone recognizes them or the truck.

Anyone with information about the robbers' identities is urged to call the Orange County Sheriff's Department.