Beirut: Fifteen people were killed on Friday in shelling on Damascus, among them six in the heart of the Syrian capital, as the Muslim fasting month of Ramadan entered its third day, a watchdog said.

“Six people were killed when three shells (likely launched by rebels) hit Baghdad street, in the centre of the city. Nine others were killed in a massive (regime) shelling of Qaboon in northwestern Damascus,” said the Syrian Observatory for Human Rights.

Several people were also wounded, the Britain-based anti-Al Assad watchdog said without giving further details.

“Shelling and clashes have raged non-stop in Qaboon all throughout the day,” said the watchdog, which relies on a broad network of activists, doctors and lawyers for its reports.

The army launched a campaign to try and retake Qaboon and other rebel districts on the outskirts of Damascus at the end of June.

The rebels fighting to topple the regime of Syrian President Bashar Al Assad have also stepped up shelling attacks on Damascus.