Latest developments in Arab world's unrest

A look at the latest developments in political unrest across the Middle East on Tuesday:

___

LIBYA

A rebel military leader complains that NATO is not doing enough to batter Moammar Gadhafi's forces and break the siege of Misrata, the last rebel outpost near Tripoli. NATO says nearly a third of Gadhafi's heavy weapons have been destroyed in airstrikes, but Gadhafi's army drives rebels out of the vital oil port of Brega again. In a new tactic, Gadhafi forces move heavy weapons into the city in an attempt to protect them from NATO airstrikes.

___

YEMEN

An exchange of fire develops as leaders of President Ali Abdullah Saleh's tribe meet with a senior army …