DONETSK, May 10, /ITAR-TASS/. Mariupol, a city in Ukraine's Donetsk region, announced Saturday the day of mourning for the victims killed in the May 9 shooting.

"May 10, 2014, is announced the day of mourning in the city of Mariupol in connection with the tragic events on May 9, 2014 in which people were killed," the City Council said in a statement, expressing sincere condolences to the victims' families.

On May 9, reports said Ukrainian law-enforcement personnel had opened fire from armoured vehicles at participants in a Victory Day rally who had gathered near the building of the local police department and tried to prevent its storm.

According to representatives of the self-proclaimed Donetsk People's Republic, at least ten people were killed in the shooting. Television ran footage of law-enforcers using armoured vehicles to crash unarmed people.

On Saturday, Ukraine's National Guard claimed it had withdrawn its units from the city.

"As of 08:00, local time /09:00, Moscow time/, May 10, the situation in the city of Mariupol has remained stably tense. National Guard units have been pulled out from the epicentre of the events," National Guard's press service said in an official statement on its website.