A roadside bomb killed six people and wounded 12 aboard a bus in Iraq's southern port city of Basra on Sunday, a provincial official said.

The blast targeted a passing U.S. military convoy but instead struck the bus and wrecked it, the head of Basra provincial council's security committee, Ali al-Ghanimi, said.

The Yemeni opposition has called for an escalation in anti-regime demonstrations to force President Ali Abdullah Saleh to leave after the embattled leader refused to quit, a spokesman said on Sunday.

"We have called upon the people to widen demonstrations, and escalate the peaceful struggle in all regions until he (Saleh) is left with one option, that is to leave," said Mohammed Sabri, a leading member of the Common Forum opposition alliance.

Thousands of Libyans celebrated victories over rebel forces claimed by Moammar Gadhafi's regime Sunday in the center of Tripoli with gunfire lasting for hours and hooting of horns.

"We are shooting to celebrate because we are beating al-Qaida. We have won, al-Qaida is gone," one soldier told an AFP correspondent, apparently unaware of rebel denials that key towns had been seized.

Oman's Sultan Qaboos has replaced two ministers, days after protests erupted demanding an end to corruption in the normally placid Gulf state, official media reported on Saturday.

The sultan has appointed Khaled bin Hilal bin Saud al-Busaidi as a minister of the royal court, replacing Sayed Ali bin Hmud al-Busaidi, the state ONA news agency said.

Saudi Arabia's interior ministry said on Saturday that protests were illegal, amid various calls for demonstrations demanding change in the ultra-conservative kingdom, state media said.

"Regulations in the kingdom forbid categorically all sorts of demonstrations, marches and sit-ins... as they contradict Islamic Sharia law and the values and traditions of Saudi society," said a ministry statement carried by SPA state news agency.

Two men were killed during clashes in Egypt between Muslims and Christians, and a church was set on fire in the village of Sol, south of Cairo, a security official said on Saturday.

"Two people were killed, and the Shahedain church set on fire in clashes between two families," the official told the MENA news agency.

Two Iranian warships, which entered the Mediterranean last month sparking an outcry from Israel, have passed through the Suez Canal back into the Red Sea, naval commander Rear Admiral Habibollah Sayari said on Saturday.

"The flotilla ... has completed its mission successfully in the Mediterranean Sea and has returned to the Red Sea transiting through the Suez Canal," the official news agency IRNA quoted Sayari as saying.

Up to 10 people were killed and more than 20 wounded in clashes between Libyan rebels and loyalists of MoammAr Gadhafi in the oil town of Ras Lanuf, doctors said Saturday.

"There are 10 dead," Doctor Awad al-Quwairi told Agence France Presse at a hospital in Brega, the next oil town along the Mediterranean coast towards the rebel-held east from where the fighting took place on Friday.

Egypt's former interior minister Habib al-Adly pleaded not guilty to corruption charges on Saturday, in the first trial of a member of ousted president Hosni Mubarak's regime.

Standing in the dock and dressed in white prison clothes, Adly denied accusations of money laundering and unlawful acquisition of public money.

At least 17 people were killed Friday when a huge explosion ripped through a military weapons depot outside Benghazi, the main city held by Libyan rebels fighting Moammar Gadhafi.

Dr. Habib al-Obeidi in Benghazi's al-Jalaa hospital said the blast also hit a residential area. Witnesses on the scene, about 32 kilometers from downtown, said ambulances were rushing to the area and secondary explosions caused two fire trucks to blow up.