Search on for fugitive bank robber Robert Estes in Denver, believed armed and dangerous, feds say

(CBS) DENVER - Authorities in Denver are searching for a fugitive 59-year-old bank robber - a repeat offender who escaped from federal custody last week and is believed to be armed and dangerous, CBS Denver reports.

Robert Estes is reportedly suspected of robbing a bank in Denver last week and another bank in a Denver-area grocery store Tuesday morning. Surveillance cameras inside the store captured that robbery as it happened, according to the station.

In the surveillance images, Estes' hand is seen tucked under his sweatshirt, which makes it appear as though he may have had a gun, according to CBS Denver.

"For that reason, we believe him to be a significant threat to public safety," U.S. Marshall's Service spokesman Charles Ahmad said.

He is then seen approaching the teller, leaning in to demand money, and is ultimately given a stack of bills.

CBS Denver reports Estes escaped from federal custody on Oct. 16. He was released from a prison in Englewood and reportedly failed to report to a halfway house.

Instead, he hailed a cab and had the driver take him to a branch of U.S. Bank, according to the station. FBI officials say Estes robbed that bank and that in that crime he also had a hand in his pocket, making it look like he had a gun.

Authorities are concerned that Estes will strike again if he isn't captured soon.

"It's our No. 1 priority. We have significant resources dedicated to locating and apprehending Gil Estes as we speak," Ahmad said.

Estes reportedly has a long criminal history. He robbed a bank in 1995 with a gun and in 2003, he called in a fake bomb to rob another bank, CBS Denver reported.

The U.S. Marshall's office is offering a $2,500 cash reward for information that leads to an arrest in the case. Anyone with information is asked to call (877) WAN-TED2.