A lawyer for Lyubov Sobol says she was held for 48 hours after questioning.

Hey says they took her from her flat and seized a laptop.

Russian authorities confirmed Friday that they had launched a criminal case, but made no mention off detention.

So Ball faces accusations off violently entering a flat that her supporters say is linked to a secret agent involved in a plot to kill Navalny.

The offenses can carry a jail term off up to two years.

Navalny was the target of a poisoning he blames on Russia's FSB security service.

The FSB denies his account off the incident, but the move against so ball is the latest in a clampdown on political opposition ahead off next year's parliamentary election.

She is planning to run for office, though out spoken Kremlin critics are often prevented from standing writing on Twitter.