They call them the "H-2-0 Gang" and all they say they want is a drink of water, but Northern Virginia police say the women requesting the drinks are far from harmless.

Feigning illness and preying on the elderly, two women posing as mother and daugther have been robbing homes in Arlington and Falls Church recently, police said yesterday. In one case the couple took antique jewelry valued at more than $4,000 from one Falls Church home, officers said.

They call them the "H-2-0 Gang" and all they say the county wherever it's a residential neighborhood." Beth Shelton, an Arlington investigator, said. "Elderly people are so sympathetic, if you look hot . . . they just don't suspect.

Thus far Arlington police said they have counted 12 cases in which the couple is known to have gotten into homes in the county. In some cases the couple is believed to operate with a third person, who slips into the house while the mother and daugther are getting water.

Police said the couple speaks in broken English and the "daugther" is about 25 years of age and her "mother" about 45. The women have been known to attack their victims and kick them, Shelton said.

Airlington police have issued grand larcency warrants for Popa Crumpia and Marissas Wick, believed to be members of a Gypsy family from New York or New Jersey, in the case, but said they have been unable to locate them.