Attack on Yemen opposition camp kills 17

Mortar shells and sniper fire struck an opposition protest camp in Sanaa on Saturday, and President Ali Abdullah Saleh's main military rival said the Yemeni leader's return to the country after a three-month absence could spark civil war.

The direction this country will take, after months of unrest and six days of major violence in the capital, may hinge on a speech Saleh is expected to give on state television on Sunday.

Earlier on Saturday, witnesses and medics said government forces attacked the main opposition protest camp in Sanaa and killed 17 protesters and opposition-allied soldiers.

Hundreds fled from the midnight attack that lasted until noon on Saturday on "Change Square", the heart of an uprising where thousands have camped for eight months calling for Saleh to give up his 33 years of power.

Saleh's main military rival, General Ali Mohsen, said the president's return was a "major catastrophe" and called on Gulf states and Western powers to stop him from igniting a civil war.

Mohsen, who dealt a blow to Saleh in March by defecting with his troops to the protesters, said in a statement that his forces were in a position to oust the president.

"The pro-revolutionary army is capable of confrontation and can decide the situation and restore the power usurped by this gang (Saleh's family)," said Mohsen.

The fractious Arabian Peninsula nation has been rocked since January by protests demanding Saleh's ouster. President Barack Obama's administration has called for Saleh to hand over power and arrange for a presidential election by the year-end.

Protest leaders accuse Saleh's administration of corruption, violence against demonstrators and doing nothing to alleviate widespread poverty.

Yemen, one of the region's poorest countries, also faces an insurgency by al Qaeda militants and has an uneasy truce with Shi'ite fighters in the north and separatism in the south.

Some senior diplomats working behind the scenes to negotiate a transfer of power deal said there were "positive" signs and that opposition political groups seemed ready to work with Saleh on an accord.

Sanaa went quiet on Saturday evening after a day of clashes and shows of force when Mohsen's troops and government forces fired missiles into the air.

Witnesses and protesters said the forces who attacked "Change Square" included the elite Republican Guard and Central Security forces. Interior Minister Muttahar al-Masri denied a raid took place, blaming the violence on "extremists".

"This brutal aggression coincides with Ali Saleh's return from Riyadh," the protesters' National Council said. "This family regime is insistent on dragging the country into a grinding war by attacking Change Square."

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