AMMAN - The Syrian army shelled rebel positions inside a Palestinian refugee camp on the edge of Damascus on Sunday killing at least 20 people, opposition campaigners said.

The Yarmouk camp, adjacent to the capital's southern entrance, has become the latest battle ground between forces loyal to Bashar Assad and rebels fighting to end the president's rule.

"Yarmouk is a dense area and shelling it always results in a human catastrophe. We have 20 people killed, including medics who had to tried to help injured people in the streets, and dozens of wounded," said activist Muhammad al-Hur.

Syria hosts half a million Palestinian refugees.

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