The FBI is offering a $5,000 reward information that identifies an alleged bank robber whom authorities are calling the “silent bandit” following hold-ups at several central Maine banks over the last five years.

In news release Monday, the FBI said it was working with police in Skowhegan, Waterville and Pittsfield to identify the person linked for four bank robberies, each of which was reported in separate years during the winter.

“During each of the robberies, the suspect passed notes to the tellers, threatening violence and demanding cash,” the FBI Boston Division said in the release. “The ‘Silent’ Bandit has never spoken during any of the robberies and he has never displayed a weapon. Following each robbery, the suspect walked calmly away from the scene.”

The robber is described by authorities as a heavyset white man who is probably 55-65 years of old; with a height of 5-foot, 6-inches to 5-foot, 10-inches tall. In each robbery, he was wearing gloves; a long, dark, hooded, rain parka; and facial coverings, while in some robberies he was also seen wearing a “mad bomber”-style hat, the FBI said.

Authorities said they’ve linked the “silent bandit” to following robberies:

• Dec. 13, 2012, at 4:40 p.m., Franklin Savings Bank, 194 Madison Ave., Skowhegan

• Feb. 21, 2013, at 4:42 p.m., Key Bank, 305 Kennedy Memorial Drive, Waterville

• Feb. 7, 2014, at 2:45 p.m., Bangor Savings Bank, 108 Somerset Ave., Pittsfield

• Feb. 12, 2015, at 5:47 p.m., TD Bank, 182 Main St., Waterville

The FBI said it was offering a reward of up to $5,000 for information “leading to the identification, arrest and prosecution of the person responsible for these robberies.”

Authorities asked that anyone with information should call the FBI at 857-386-2000 or the Waterville Police Department at 1-207-680-4700. Tips can also be electronically submitted at tips.fbi.gov.