Five rockets hit a U.S. air base in Afghanistan on Thursday, but there were no casualties, two senior security officials said, and no group immediately claimed responsibility.

The attack comes as the Afghan government has launched the release of Taliban prisoners from a jail near the Bagram base, as part of a confidence-building step in a U.S.-Taliban peace deal aimed at ending about two decades of war in Afghanistan.
"Five rockets were fired at Bagram airfield early this morning," the NATO-led mission, Resolute Support, said on Twitter. "There were no casualties or injuries."
The rockets targeting the largest U.S. military compound in Afghanistan were fired from a vehicle parked in an adjoining village.
A hundred Taliban members are scheduled to be freed on Thursday from the detention facility near the base, following Wednesday's release of 100 members of the hardline Islamist group.
The prisoner exchange deal provides for the government to free 5,000 Taliban prisoners, with the Taliban releasing 1,000 members of the Afghan security forces in exchange.
But the Taliban rebuffed the overture, saying they were unable to verify which prisoners had been released.