A look at the latest developments in political unrest across the Middle East on Saturday:
A NATO airstrike intended to thwart Moammar Gadhafi's forces kills 13 rebels instead, opposition officials say, but they call it an "unfortunate accident" and stress it doesn't diminish their support for the international air campaign that is aimed at protecting them. NATO says it's investigating, but it appears that its aircraft were retaliating against ground fire. Two rebels who survived the strike say it happened after somebody in their convoy fired heavy weaponry into the air.
Medical officials in the besieged western city of Misrata say government forces killed 37 civilians over the past two days in an unrelenting campaign of shelling and sniper fire and an attack that burned down the city's main stocks of flour and sugar.
Syrian authorities tighten security and make sweeping arrests as President Bashar Assad tries to cut off two weeks of deadly pro-democracy demonstrations that are threatening his family's ruling dynasty. U.N. Secretary-General Ban Ki-moon expresses deep concern about the violence and calls on Syria's government to address the "legitimate aspirations of the Syrian people."
Yemen's opposition presents its clearest vision yet of how it hopes to see power transferred as it presses for the ouster of longtime leader President Ali Abdullah Saleh. Tens of thousands of anti-government protesters hurl stones at riot police backed by tanks in the southern province of Aden, as dueling rallies are held in the capital.
Dozens of protesters stage a sit-in in the capital, Muscat, to demand probes into alleged state abuses after clashes with security forces left at least one person dead and sharply boosted tensions in the strategic Gulf nation. The unrest suggests that high-level shake-ups and other concessions by Oman's rulers have fallen short of the demonstrators' demands for greater political freedoms.
Iraqi Prime Minister Nouri al-Maliki calls the international crackdown on Libya's Moammar Gadhafi "selective," chastising foreign forces for singling out one oppressive Mideast regime without helping peaceful protesters in others. He makes clear he isn't advocating widespread use of military force, but the Shiite-led Iraqi government has been frustrated with the West's hands-off approach to the crackdown in Bahrain, where Shiite protesters are challenging a Sunni-led leadership closely allied with Washington.