Suffolk police arrested a Mastic man Tuesday who they say robbed four banks in 11 days this month.

Police said William Mendolia, 55, robbed four banks in Center Moriches, Mastic and Shirley from April 9 to April 19. All four banks were robbed by a suspect who demanded cash after giving a threatening note to bank tellers, police said.

The Pattern Crime Unit used video surveillance and tips from the community to identify Mendolia, who police said is homeless. After they identified him, unit detectives placed him under surveillance and arrested him at a relative's home at 5 Rutland Ave. in Mastic about 1:30 p.m. Tuesday.

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Mendolia was charged with four counts of third-degree robbery for the following bank robberies:

April 9 - HSBC, 1718 Montauk Highway, Mastic

April 13 - Empire National Bank, 1044 William Floyd Parkway, Shirley

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April 16 - Chase Bank, 790 Main St., Center Moriches

April 19 - TD Bank, 530 William Floyd Parkway, Shirley

Police say William Mendolia, 55, of Mastic, robbed four banks in Center Moriches, Mastic and Shirley from April 9 to April 19, 2015. He was arrested on Tuesday, April 21, 2015. Photo Credit: SCPD

Mendolia was being held overnight at the Seventh Precinct and is scheduled to be arraigned at First District Court in Central Islip on Wednesday.

Anyone with information about these robberies is asked to call Crime Stoppers anonymously at 800-220-TIPS. All calls will be kept confidential.