Suffolk County police are searching for a man they said tried to rob a Melville bank but walked out empty-handed Thursday morning.

The man, wearing a black mask, entered the Citibank branch at 425 Broadhollow Rd. at about 11:25 a.m. He placed a bag on the counter and a teller backed away, police said.

The man handed a note demanding cash to a second teller, who also backed away. The man then fled the bank.

Police said he appeared to be 20 to 30 years old, 5-foot-8 to 5-foot-10, with a medium build.

Detectives are asking those with information to call Crime Stoppers at 1-800-220-TIPS. All calls will be kept confidential.

A combination of turning to the public and the FBI for help, and using cutting-edge DNA technology helped investigators finally identify Rex Heuermann as the prime suspect in the Gilgo Beach serial murders. NewsdayTV's Virginia Huie has the story.

How investigators cracked the Gilgo Beach murders case A combination of turning to the public and the FBI for help, and using cutting-edge DNA technology helped investigators finally identify Rex Heuermann as the prime suspect in the Gilgo Beach serial murders. NewsdayTV's Virginia Huie has the story.

A combination of turning to the public and the FBI for help, and using cutting-edge DNA technology helped investigators finally identify Rex Heuermann as the prime suspect in the Gilgo Beach serial murders. NewsdayTV's Virginia Huie has the story.

How investigators cracked the Gilgo Beach murders case A combination of turning to the public and the FBI for help, and using cutting-edge DNA technology helped investigators finally identify Rex Heuermann as the prime suspect in the Gilgo Beach serial murders. NewsdayTV's Virginia Huie has the story.

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