The standoff between Euromaidan activists and law enforcement officers on Hrushevskoho Street in central Kyiv has worsened on Wednesday morning.

For nearly half an hour Hrushevskoho Street, from which the protestors were ousted earlier, started filling up with activists in orange helmets again, an Interfax-Ukraine correspondent said.

Officers from the Berkut special police unit, who dismantled the barricade and took up a 500-meter-long part of the street - as far as Dnipro Hotel - had to retreat.

The demonstrators are heading towards former barricades on Hrushevskoho Street. To the stun grenade firings by Berkut they are responding with fireworks and stones.

The loudspeakers installed behind the Berkut cordon are warning of the responsibility for unlawful actions.

The Berkut officers climbed onto the barricades towards protestors on Hrushevskoho Street, after allegations that the protestors added liquid nitrogen, a dangerous substance causing chemical burns, to Molotov cocktails, a source in law enforcement agencies told Interfax-Ukraine on Wednesday.

There has been an intelligence that "protestors made a new Molotov cocktail with liquid nitrogen added to it," the source said.

"This is why Berkut moved towards the demonstrators," the source said.

No official confirmation of this information has been made available to Interfax-Ukraine.