A serial gas station robber has struck again, this time holding up a Mobil on Old Country Road in Westbury -- possibly his 15th such armed robbery on Long Island since last month, police said.

Police said it's believed to be the ninth in Nassau by the suspect since an Aug. 4 robbery of a BP station in Hempstead. In Suffolk, police believe the same man also is responsible for at least six armed gas station robberies.

Nassau County police said the latest robbery occurred Wednesday at 10:38 p.m.No one was injured.

VideoCops: Gas station robbery linked to string of holdups

The suspect Wednesday night wore a white bucket hat, police said. In most of the robberies, the suspect was described as wearing either a white or black bucket hat -- though a police sketch released this month showed the man wearing a black-and-white baseball cap.

Another common thread in the robberies is that the suspect has covered his handgun in a cloth or T-shirt, police said. On Wednesday night, police said that black semiautomatic handgun was covered with a green cloth. Police said he entered the Mobil station, demanded cash from the male clerk, got it and fled on foot west onto Myrtle Avenue.

He is described as being about 5-foot-8, in his 20s, with a thin build. He wore blue jeans, a black short-sleeved T-shirt, black-and-white sneakers, and the white bucket hat.

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Police said that since Aug. 4, they believe the same man has committed 14 other gas station robberies from Elmont to Riverhead. Nassau police have not said how much money was stolen in the nine robberies there, but Suffolk police said that the suspect has taken between $500 and $850 in each of the six robberies there.

Police ask anyone with information about the suspect to call Nassau Crime Stoppers at 800-244-TIPS. Suffolk police also have asked anyone with information to call Suffolk Crime Stoppers at 800-220-TIPS. All calls will remain confidential, police said.