Ukraine accused Russia of sponsoring a terrorist attack on a peace march in the city of Kharkiv that left two dead and at least 10 wounded.
In the deadliest blast of a bombing campaign by pro-Russian separatists, an explosive device was thrown from a car towards marchers who were commemorating the deaths of more than 100 protesters in last year's revolution.
Ukrainian authorities said they had arrested four suspects shortly after the attack, claiming that the men had received training in a Russian city just across the border.
"They are Ukrainian citizens, who underwent instruction and received weapons in the Russian Federation, in Belgorod," said Markian Lubkivskyi, an aide to the head of the Ukrainian security agency, the SBU.
The blast was the latest in several months of bomb attacks on targets in government-held cities including Kharkiv, Odessa, Mariupol and Kiev. Previous bombings tended to avoid casualties, targeting the offices of pro-Kiev groups or infrastructure at night. Before yesterday, the bloodiest attack had been the bombing of a bar in Kharkiv on November 9 that injured 11 people.
