News that the woman could not be located was first reported by Russian independent website Meduza, according to Poland's rp.pl website.
Ovsyannikova, who was detained after her protest, was originally believed to be in custody at a police station in Moscow’s Ostankino district. However, when the lawyers arrived at the station, they were told that the journalist was not there, rp.pl reported.
Nor was Ovsyannikova to be found at the Ostankino TV centre, despite reports to this effect, rp.pl said.
So far, it has not been possible to establish where the journalist is being held, the Polish website reported.
Meanwhile, British Foreign Office Minister James Cleverly said that such acts of defiance as Ovsyannikova’s “are important” and show a "huge deal of bravery" in what is an oppressive, authoritarian state, rp.pl wrote.
Speaking in an interview with the British broadcaster BBC, Cleverly added that it's "really important” that the Russian people understand what is being done in their name in Ukraine, as they have been "systematically lied to by Putin," rp.pl reported.
'Stop the war'
On Monday, Ovsyannikova ran onto the set of an evening news programme on Russia’s state-controlled Channel 1, holding an anti-war sign, according to rp.pl.
The sign read: "No war, stop the war, don't believe the propaganda, they are lying to you here."
Ovsyannikova stood behind the Channel 1 presenter and her anti-war sign was clearly visible to viewers, rp.pl reported.
Tuesday is day 20 of the Russian invasion of Ukraine, which began on February 24.
(pm/gs)
Source: rp.pl, bbc.com