Five people were reportedly hurt when a fire broke out at a Ukrainian television station in Kyiv.
TV Inter's headquarters caught fire on September 4 after a group of around 20 protesters gathered outside the building and set tires afire and threw them in the building.
Reports say that several employees were treated for carbon-monoxide poisoning while another suffered a broken leg, according to an Inter statement.
Kyiv police official Andrei Krishenko said witnesses indicated a smoke bomb was thrown into the building.
Authorities said they had arrested six people in connection with the fire.
The station continued broadcasting from mobile facilities outside the building.
The station is widely regarded by many Ukrainians as being pro-Russia. The affiliation of the protesters was not clear.
A conflict in eastern Ukraine between Russia-backed separatists and Ukrainian troops has killed more than 9,500 people.
Based on reporting by AP, Interfax, and TASS