Federal officials are offering a reward for information leading to the arrest of a suspect who fired one shot in a busy Long Island City bank during a failed December 7 robbery attempt.

The suspect, wearing a black hat, coat and gloves and a dark gray scarf, entered the HSBC bank branch at 22-15 43rd Ave. at about 8:45 a.m. on December 7, where he pointed a silver revolver through a teller’s window and demanded cash.

The gunman then fired a single shot into the ceiling, sending employees and customers scattering – diving for their lives, authorities said.

The gunman then fled empty-handed, in a black Lincoln Town Car that had been waiting about a block away, an FBI spokesperson said.

The suspect is described as about 35 years old, 5-feet, 7-inches tall and 185 pounds. He is also suspected of robbing a Capital One bank branch at 185 Broadway in Manhattan on October 18.

The FBI is warning the public not to approach the armed suspect if he is spotted.

Anyone with information is asked to call the FBI at 212-384-1000.