An explosion outside the U.S. mission in Libya’s eastern city of Benghazi caused no injuries but heightened concerns about instability in the country as it plans for elections.

A U.S. official said the administration “deplores the attack” outside the diplomatic office and will continue to support democracy in Libya.

A U.S. official in Libya says the attack late Tuesday damaged the front gate of the mission. Speaking on condition of anonymity, the official told VOA that the main building was not affected.

The explosion near the U.S. diplomatic office came a day after Libya’s main airport reopened following the seizure of the facility by disgruntled militiamen.

It also happened hours after U.S. officials said a drone strike in northwestern Pakistan killed al-Qaida’s second in command, ( Abu Yahya al-Libi ) who was a Libyan national. U.S. diplomats reportedly asked for increased security in Libya.