Explosions have been heard in the south-eastern Ukrainian city of Mariupol, despite a ceasefire agreed by the government and pro-Russian rebels, reports GHN based on BBC.
A BBC correspondent there says intense blasts from the eastern edges rippled across the city late on Saturday. The fighting subsided overnight.
Mariupol is seen by the rebels as a key city on the route to Crimea.
On Saturday, the Ukrainian and Russian presidents said the ceasefire in eastern Ukraine was "largely holding".
It was signed during talks between representatives of Ukraine, Russia, the Organization for Security and Co-operation in Europe (OSCE) and pro-Russia rebels in Belarus and came into effect at on Friday.
There were no reports of major fighting in the east for the first 24 hours, but by Saturday evening the BBC's Fergal Keane tweeted from Mariupolthat shelling had resumed.
There were explosions on the eastern fringes of the city close to government checkpoints, he said, and duels between artillery on both sides.
A checkpoint held by Ukraine loyalists seemed to be on fire, according to AFP journalists close to the scene.