Ukrainian law enforcement authorities continue the investigation into the events related to the arson attack on the building where National Information Systems (NIS) Company, which produces programs for the Inter television channel, is headquartered in Kyiv, Ukrainian National Police Chief Khatia Dekanoidze said.

"I don't have any new facts at this point, the investigation is underway," Dekanoidze said in Kyiv on Monday when asked how the probe into the arson attack on the NIS office was progressing.

It was reported earlier that on September 4, a group of activists protesting the Inter television channel's editorial policy set fire to car tires outside the NIS office on Shchusev Street in Kyiv.

At the same time, a group of unidentified persons wearing masks snuck into the building and, using force, committed an arson attack on the first and second floors where the company's premises are situated. Later, when fire brigades put out fires over areas of 10 and 20 square meters, some perpetrators repeatedly set fire to the NIS offices on the second floor, causing the burning out of another 60 square meters of offices, including the company's server room.

The incident caused no fatalities, but several employees of the company were intoxicated with combustion gases and sought medical attention. Apart from that, Inter reported that a female employee at NIS inured her leg during the evacuation.

The arsonists who infiltrated the office building were not detained. Police have not yet said if they have identified the assailants.

The criminal case has been investigated under the Ukrainian Criminal Code articles 'Hooliganism' and 'Intentional Damage to Property'. Investigators are looking into several theories of the fire incident in the building, including felony arson, the chief of Kyiv's National Police main directorate, Andriy Krishchenko, said.