Six women complained last month that their drinks may have been spiked at establishments in Arlington, the police there said.

       In each instance, the women reported losing consciousness and experiencing memory loss after visits to nightlife establishments in Clarendon and Crystal City, the Arlington police said. The two areas are major nightlife and entertainment sites in the Northern Virginia suburb.

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       The women think their drinks “may have been tampered with,” the police said Friday.

       Police said they are investigating. No link among the incidents has been discovered, the police said.

       In their statement, the police described drink-spiking as placing drugs or alcohol into a drink without the drinker’s knowledge or permission. Spiking is illegal in Virginia, police said.

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       It was unclear whether the women who complained suffered any other injury or were victims of other crimes.

       In Britain, a police organization listed 198 reports of spiking in September and October, a recent news account said.

       Arlington police offered safety tips including never leaving a drink unattended, not accepting drinks from strangers and not drinking anything without seeing it poured.