Ukraine's government has resumed military action to tackle pro-Russian separatists in the east, after a day of deadly violence in the city of Odessa. Interior Minister Arsen Avakov confirmed the "active phase of the operation continued at dawn", with attacks around the town of Kramatorsk. On Friday dozens of people died in a fire at a building taken over by pro-Russians in Odessa in the south-west. The US condemned the violence as "senseless". Mr Avakov said Ukrainian forces had on Saturday taken a television tower in Kramatorsk, which is about 17km from the pro-Russian separatists' stronghold of Sloviansk. "We are not stopping," Mr Avakov wrote on his Facebook page. The ministry said pro-Russian separatists had attacked the armed forces and two Ukrainian soldiers were killed. Pro-Russian groups confirmed this, but also said there had been civilian casualties. There is no confirmation. The operations come a day after running battles between pro-Kiev groups and separatists in Odessa, which culminated in the fire at the Trade Unions House that left at least 36 dead. Officials said some people were overwhelmed by smoke and others died after they jumped from the building.