They have accused government opposition groups of conducting campaigns of human-rights abuses and indiscriminate attacks against civilians.

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The Iraqi government said the operation that began March 25 targeted criminals who had been carrying out indiscriminate attacks, burglaries and oil smuggling.

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MSF, which on Friday received the Nobel peace prize, said indiscriminate attacks by artillery and aerial bombing of areas with civilian populations had resulted in numerous casualties.

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But al Qaeda's indiscriminate attacks on civilians in places such as Jordan and in war-torn Iraq alienated many Muslims, who were repelled by the disregard for fellow Muslims' lives.

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The well-planned but indiscriminate attacks targeted two luxury hotels, a Jewish center and the Victoria Terminus train station, where the boy's parents, uncle and three cousins waited to board.

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Yet the Madrid bombers appear to have eschewed it, though the simultaneity and wantonly indiscriminate lethality of the attacks were familiar.

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It says attacks "could be indiscriminate, including in places frequented by expatriates and foreign travellers".

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Homs came under weeks of relentless attacks by government forces, including indiscriminate shelling on civilian areas.

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