TRIPOLI, Libya— Islamic hard-liners have attacked about a half-dozen shrines in and around Tripoli belonging to Muslim sects whose practices they see as sacrilegious, raising religious tensions as Libya struggles to define its identity after Moammar Gadhafi's ouster.

The vandalism has drawn concern at the highest levels as Libya's new rulers seek to reassure the international community that extremists will not gain influence in the North African nation.

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