On 10 June, Khaled Al-Bakir, a citizen journalist also known as Abu Sliman, 30, was killed by an artillery shell in the town of Al-Qassir, south of Homs.

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Also on Tuesday, an artillery shell struck inside a second U.N. school in the same town, but the boys' prep school was empty at the time, UNRWA director John Ging said.

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Every few minutes another artillery shell is launched.

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Still, it is hard to imagine any of the Association of South-East Asian Nations (ASEAN) locking horns, apart perhaps from Cambodia and Thailand, who lob the occasional artillery shell at each other over a disputed temple on the border.

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Amani Kabasha, the M23 rebel spokesman, said that the national army used heavy artillery to shell the rebel base.

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