Libyan leader Moammar Gadhafi threatened retaliation against Europe on Friday unless NATO ceases its operations, warning loyalist forces can launch stinging attacks like "locusts and bees."

"The Libyan people are capable, one day, of taking the battle to Europe and the Mediterranean," Gadhafi said in a speech broadcast by loudspeaker to thousands of loyalists gathered in Tripoli's emblematic Green Square.

Syrian forces killed 28 civilians on Friday on a day of massive anti-regime rallies and in shelling of villages in the northwestern province of Idlib, human rights activists said.

State television meanwhile reported that President Bashar Assad sacked the governor of Hama, a day after half a million protesters flooded the central city demanding the ouster of their embattled leader.

Moroccans on Friday overwhelmingly approved curbs on the near absolute powers of King Mohammed VI, with 98 percent voting "yes" in a referendum put forward after protests inspired by uprisings in the Arab world.

Interior Minister Taib Cherkaoui announced the result on state television after 94 percent of polling stations had reported results, adding that voter turnout had been 72.65 percent.

Bahrain's Sunni rulers opened a "national dialogue" Saturday aimed at getting reforms back on track after a deadly March crackdown on Shiite-led protests, buoyed by an 11th-hour decision by the main Shiite opposition bloc to take part.

Parliament speaker Khalifa Dhahrani told the opening session, which was broadcast by state television, that the dialogue would have "no preconditions and no ceiling" on the demands that could be raised by delegates.

Libyan leader Moammar Gadhafi on Friday urged his supporters to get back the weapons that France supplied to rebels in the Nafusa mountains who are battling his regime.

"March on the jebel (Nafusa) and seize the weapons that the French have supplied. If later you want to pardon them (the rebels), that's up to you," the embattled Gadhafi said in a message played over loudspeakers in central Tripoli.

Protesters converged on Cairo's Tahrir Square on Friday to join camping pro-democracy activists for a demonstration to keep up the pressure on the country's military rulers over the pace of reforms.

Thousands of protesters were in the square including families of victims who died in the uprising to call for the trial of police officers implicated in the deaths, Agence France Presse reported.

African leaders agreed Friday on a peace plan that rules Libyan leader Moammar Gadhafi out of talks with rebels to end the four-month conflict in his country, a top official said.

The plan, which has to be presented to the Libyan regime and rebels, says "Gadhafi must not participate in negotiations", the head of the African Union peace council, Ramtane Lamamra, told Agence France Presse.

A U.S. vessel aiming to break Israel's naval blockade on Gaza sailed from Greece Friday but was promptly stopped by coastguards for defying a ban, an activist on board said.

The Audacity of Hope set sail for Gaza without warning, leaving behind nine other ships in a pro-Palestinian international flotilla.

Hundreds of thousands of protesters staged huge rallies across Yemen on Friday calling for the departure of all figures in the regime of President Ali Abdullah Saleh, who has been hospitalized in Riyadh for nearly a month.

Saleh supporters also massed in Sanaa to express what they described as their "loyalty" to the veteran leader, who is receiving treatment from wounds sustained in an explosion at his presidential compound on June 3.

Syrian security forces on Friday killed 11 civilians as more than half a million people took to the streets across the country to demand the departure of President Bashar al-Assad, activists said.

Six people died in the central city of Homs when security forces opened fire to quash protests, two were killed in Damascus and one in Daraya, near the capital, activists told Agence France Presse.