Violence across Syria killed at least 10 civilians on Friday, a rights watchdog said, as anti-regime demonstrators prepared to take to the streets after weekly prayers. Three people died when troops opened fire on their vehicle near an intersection in central Hama province, and three others died in the nearby region of Homs, said the Syrian Observatory for Human Rights. A couple and their child were killed when they were struck by gunfire in the northern city of Aleppo, the Britain-based watchdog said, adding regime forces killed another civilian in eastern Deir Ezzor province. Activists in the area said the family was killed by pro-regime gunmen. Opposition activists have called for protests across the country after the weekly Muslim prayers under the slogan "Our loyalty (to the revolution) is our salvation". Anti-regime demonstrations have been staged after prayers each Friday since the revolt against President Bashar al-Assad's iron-fisted rule broke out in March 2011. The violence has killed more than 11,000 people, according to the watchdog. On Thursday 23 people died, including four students killed when regime troops stormed the campus at Aleppo University, in northern Syria, following anti-regime protests. The killings marked a serious escalation in Syria's second city and commercial hub, largely spared the violence shaking the country for nearly 14 months. The unrest has persisted despite a tenuous UN-backed ceasefire that went into effect on April 12 and the presence of UN observers monitoring the truce. Major General Robert Mood, the veteran Norwegian peacekeeper in charge of the hard-won military observer mission, said it was expected that it would take time for the ceasefire to take hold. "It is not surprising that we see sometimes spikes of violence, this cannot obviously go on forever and I call everyone to choose a political way of cessation of violence," he told reporters on Thursday.