The energy released in an explosion of a device in a Toyota Camry car downtown Kyiv killing Georgian citizen Timur Makhauri and injuring two more persons equaled from 600 grams to 1 kilogram of TNT equivalent, the Ukrainian interior minister's advisor, Zoryan Shkiriak, has said.

"The investigation continues. According to preliminary information of experts, the energy released in the explosion was from 600 grams to 1 kg of TNT equivalent. All the required operational and investigative actions are underway and circumstances are being clarified, Shkiriak on the 112.Ukraine TV on Saturday.

He said that the place of installation of explosives in the car and its type is being clarified.

The investigators are working out several versions of this crime.

"We are working on all the versions that are possible ... Taking into account the deceased person, he was not an ordinary person, today everything is being done to establish all the circumstances of this crime. I could be, of course, the FSB, that is Russian security service. It may be a contract murder. It may be personal enmity and skirmish between the business and criminals. The operational-investigation groups must be given an opportunity to actively work in order to thoroughly understand this heinous crime," Shkiriak said.

He also did not rule out that one of the factors in the murder of Makhauri could be his participation in the anti-terrorist operation (ATO) in the Donbas.

Later, on his Facebook page, Shkiriak said that currenctly the following possible versions of the crime are being worked through: 1) willful murder; 2.) an act of terrorism; 3) Russian intelligence services; 4) skirmish between the business and criminals; 5) personal dislike; 6) personal revenge.

In turn, the Security Service of Ukraine (SBU) reported that the Russian intelligence services had long been "hunted" for Makhauri, who died in the center of Kyiv on September 8.

"Ali Timaev, nickname -"Timur Makhauri", was born on April 4, 1978 in the village of Guchum-Kale, Itum-Kalinsky district, the Chechen Republic. Using all possible means he fought against the "Putin" regime. He was Ramzan Kadyrov's personal enemy. Intelligence services of the Russian Federation and the Chechen Republic were permanently haunting him," the SBU wrote on its Facebook page.

According to the Ukrainian security service, Makhauri during the period from 1999 to 2000 participated in military operations against Russian troops in the Republic of Dagestan, and received a gunshot wound. In 2008, he took part in the Georgian-Russian war on the side of Georgia. He maintained friendly relations with the fighters who took part in the fighting in the ATO area.

"He was hunted for a long time by the Russian security services. Totally, he was assassinated three times, including on March 8, 2009 in Tbilisi by an explosion of the entrance of an apartment building. Then Ali survived," the SBU reported.

As reported, a Toyota Camry with Georgian license plates was blown up in central Kyiv on September 8 by means of a planted explosive device, killing Georgian citizen Timur Makhauri and severely injuring his wife; the third passenger, a child, was not harmed.