Mojtaba Khamenei chosen as Iran's next supreme leader, Iranian state media reports

The Qatari Interior Ministry announced overnight on Thursday that it was evacuating residents near the United States embassy as a temporary precautionary measure.

The announcement comes after the Al Udeid Air Base -- the largest U.S. military base in the Middle East -- was struck by a ballistic missile from Iran on Wednesday, the Qatari Ministry of Defense said at the time.

No one was injured, it said.

A second ballistic missile launched from Iran on Wednesday was intercepted, the defense ministry said.

The State Department announced on Wednesday that a charter flight for American citizens stuck in the Middle East is en route to the United States, "as part of our ongoing efforts to assist Americans return home."

The agency said additional flights will be departing from the UAE, Qatar, Saudi Arabia and Israel.

The American Foreign Service Association, in a statement on Wednesday, said the current crisis in the Middle East "exposes real gaps in America's diplomatic readiness" and says leadership gaps -- notably the lack of Senate-confirmed ambassadors at several postings in the region -- are "impossible to ignore."

AFSA is the union and professional organization of the U.S. Foreign Service and represents 23,000 active and retired Foreign Service employees.

"At a moment of escalating regional instability, that absence of Senate-confirmed leadership matters. At the same time, attempts to push through reductions in force have left many of these embassies and the offices that support them critically understaffed," AFSA said.

"The safety of America’s diplomats and their families must remain paramount. America cannot safeguard its national interests if it cannot safeguard the diplomats who advance them. AFSA will continue urging foreign affairs agencies and policymakers to ensure that those serving overseas have the leadership, expertise, and resources they need to carry out their mission safely," the union continued.

-ABC News' Mariam Khan

The Senate on Wednesday rejected a Democratic-led Iran war powers resolution that called for congressional approval for military action against Iran.

The procedural vote, which directed the removal of United States armed forces from hostilities within or against Iran that have not been authorized by Congress, failed by a vote of 47 to 53.

Sen. Rand Paul, who co-sponsored the resolution, was the only Republican to cast a vote in favor of it. Sen. John Fetterman was the only Democrat to vote against it.