The abduction in Tripoli comes two days after Jordan's ambassador to Libya was seized.
Thousands of Muslim Brotherhood supporters have been jailed since the ouster of President Mursi.
New delay comes after a shooting attack in the West Bank, days before negotiations are set to expire.
U.S.-brokered mediations faltered last week when Israel announced plans for new settlement homes.
U.S.-mediated peace talks appeared near collapse this week, as deadline for negotiations nears.
Calls nomination of a former hostage-taker as ambassador to U.N. "extremely troubling."
The Palestinian president signed over a dozen conventions with world bodies in a move that threatens to further stall U.S.-mediated peace talks with Israel.
U.S. secretary of state meets with Israeli prime minister for the second time in less than 12 hours.
Supreme leader said Iran had agreed to the talks to "break the hostile atmosphere."
Freeze comes in retaliation for the P.A.'s moves to seek statehood from over a dozen international bodies.
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