The Taliban have continued attacks even as peace talks with the Kabul government are underway.
The airstrikes come as Taliban and government-appointed negotiators are meeting for the first time in Qatar.
The embassy didn't provide specifics, including how imminent the threat is.
The U.N. Security Council unanimously adopted a resolution welcoming the start of negotiations.
The two sides are in the early stages of meetings in the capital Doha.
Negotiations will be arduous and messy, delegates warned during the opening ceremony.
The negotiations were laid out in a peace deal Washington brokered with the Taliban and signed in Doha on Feb. 29.
Afghan leaders must seize this historic opportunity for peace, the State Department said in a release.
Pakistan approved several orders to implement U.N. sanctions against a number of outlawed groups, including the Taliban.
U.S. intelligence officials believe a foreign government paid "bounties" to the Haqqani network.
Maj. Gen. John Richardson IV has launched a yearlong effort to heal the base's deeply scarred image.
Congressman Dan Crenshaw is a former Navy SEAL and the headliner in one of the most hyped-up joint campaign ads ever.
You may soon be able to pick up your prescriptions at the commissary or exchange without waiting in line.
The Marine Corps is considering a plan in which it could funnel all recruits to a new base.
The mere possibility of the Marine Corps shaking up where it trains new recruits has drawn swift backlash.