WNBA star Brittney Griner in custody in Russia after cannabis vaping oil allegedly found in luggage

WNBA All-Star Brittney Griner has been in custody in Russia for at least a week in the wake of officials at Moscow airport finding what they said was cannabis vape cartridges in her luggage.

The Russian Customs Service said on Saturday she had cartridges that contained oil derived from cannabis — an offence that could carry a maximum penalty of 10 years in prison.

Without identifying Griner, a centre for the WNBA's Phoenix Mercury, said a player was detained in February after arriving at Moscow's Sheremetyevo airport on a flight from New York.

Russian news agency TASS identified the player as Griner, citing a source.

The Phoenix Mercury team, without elaborating, said: "We are aware of and are closely monitoring the situation with Brittney Griner in Russia."

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It was not clear when in February Griner was detained. The player is still in custody and an investigation is underway, the customs service says.

"We are aware of the situation with Brittney Griner in Russia and are in close contact with her, her legal representation in Russia, her family, her teams, and the WNBA and NBA," Griner's agent, Lindsay Kagawa Colas, said.

"As this is an ongoing legal matter, we are not able to comment further on the specifics of her case but can confirm that as we work to get her home, her mental and physical health remain our primary concern."

On Saturday, the State Department issued a "do not travel" advisory for Russia because of Moscow's invasion of Ukraine.

Washington urged all US citizens to depart immediately, citing factors including "the potential for harassment against US citizens by Russian government security officials" and "the embassy's limited ability to assist" Americans in Russia.

Griner has played in Russia during the winter for the past seven years, earning more than $US1 million ($1.36 million) per season — more than quadruple her WNBA salary.

She last played for her Russian team, UMMC Ekaterinburg, on January 29 before the league took a two-week break in early February for the FIBA World Cup qualifying tournaments.

More than a dozen WNBA players were playing in Russia and Ukraine this winter, including league MVP Jonquel Jones and Courtney Vandersloot and Allie Quigley of the champion Chicago Sky.

The WNBA confirmed on Saturday that all players besides Griner had left both countries.

Griner, 31, has won two Olympic gold medals with the US, a WNBA championship with the Mercury and a national championship at Baylor. She is a seven-time All-Star.

"Brittney Griner has the WNBA's full support and our main priority is her swift and safe return to the United States," the league said in a statement.

AP/Reuters