A gunman robbed a Franklin Square bank Tuesday and ran out a rear door with money, Nassau police said.

The robber approached a teller at the Franklin Avenue Citibank branch just before 3:15 p.m., showed his handgun and demanded money, police said. It's not clear how much cash he got, but he escaped through the parking lot and was last seen heading north into a creek bed by the CVS store, police said.

Detectives said the robber was in his 30s, about 5 feet, 8 inches tall with a thin build and shoulder-length brown hair. He was wearing a camouflage T-shirt; a green, hooded jacket; black jeans and white sneakers, police said.

Anyone with information is asked to call Crime Stoppers at 800-244-TIPS.

NewsdayTV's Doug Geed is heading 'Out East' to showcase the ultimate local spots you need to explore. Credit: Randee Daddona, Michael A. Rupolo Sr.

Out East Show: Visit The Shamrock evergreen maze, Sannino Vineyard, Seven Ponds Orchard and the Warrior Ranch Foundation NewsdayTV's Doug Geed is heading 'Out East' to showcase the ultimate local spots you need to explore.

NewsdayTV's Doug Geed is heading 'Out East' to showcase the ultimate local spots you need to explore. Credit: Randee Daddona, Michael A. Rupolo Sr.

Out East Show: Visit The Shamrock evergreen maze, Sannino Vineyard, Seven Ponds Orchard and the Warrior Ranch Foundation NewsdayTV's Doug Geed is heading 'Out East' to showcase the ultimate local spots you need to explore.

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