Unknown gunmen opened fire at the car of a local lawmaker in the center of Ukrainian capital of Kiev on Sunday, killing his three-year old son, a police source said.

Vyacheslav Sobolev, a businessman and Kiev regional council lawmaker was at wheel of the car when it was attacked, said the source, who wished to remain anonymous.

“As a result of a gunshot wound, a child died in a car ambulance on the way to hospital,” Ukraine’s Ministry of Internal Affairs said on Facebook.

There have been several murders of well-known figures on the streets of Kiev since Russia annexed Crimea and a pro-Moscow rebellion flared up in east Ukraine in 2014.

Pavel Sheremet, a Belarussian journalist known for his criticism of his home country’s leadership and his friendship with the slain Russian opposition leader Boris Nemtsov, was killed in a car bomb in Kiev in 2016.