In St. Petersburg, an employee of the headquarters of Alexei Navalny, Elena Mazovetskaya, was detained. This was reported on the twitter of the headquarters.
At the time of her arrest, Mazowiecka was on her way to the picket with placards. She was taken to police station No. 1, there is no contact with her.
UPD 22:49 The girl was released from the department after identification.