Panetta said Libyan officials have made a "strong effort" to improve security.
Read more...U.S. embassies throughout the Middle East and beyond have become the target of at least 20 protests.
Read more...The drones have come after U.S. Marines' deployment to Libya.
Read more...Fifty Marines were sent to Libya to reinforce security at U.S. diplomatic facilities.
Read more...Two Americans and two Pakistanis were injured in the explosion.
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