Nobody was hurt in the incident on September 4
Ukrainian TV station damaged by fire, TV Inter's headquarters caught fire after a group of around 20 protesters gathered outside the building and set tires afire and threw them in the building, RFE/RL reports.
Kyiv police official Andrei Krishenko said witnesses believed a smoke bomb had been 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.