The video, uploaded by local resident Viktor Zubritsky, shows several shells landing in a residential area of Mariupol and blowing up a moving truck in front.

At least 30 people were killed and another 100 were injured when the center of port city, which has remained relatively insulated from violence throughout the majority of the Ukrainian conflict, was bombarded on Saturday.

The shells – allegedly fired from Grad and Uragan multiple rocket launchers – hit a local market, schools, shops and private homes.

READ MORE: Donetsk militia 'not going to storm Mariupol', trades accusations with Kiev

The Kiev forces and the separatist militias, who have been fighting in south-eastern Ukraine since last April, have been trading blame for the incident.