A rocket fired on a US airbase in Afghanistan has damaged the aircraft of America's top military officer and wounded two maintenance crew.
Two rockets fired by insurgents struck the vast Bagram airfield early today local time, with one causing damage to the C-17 used by General Martin Dempsey, chairman of the US Joint Chiefs of Staff, who left the base using another plane, his spokesman Colonel Dave Lapan said.
Shrapnel from the rocket struck the door of the plane while it was parked on the runway, with two American maintenance crew suffering minor injuries in the attack, Lapan said.
The attack posed no threat to the safety of Dempsey or his staff, who were asleep in their quarters at the time of the incident, officers said.
Although sporadic shelling of Bagram is not uncommon, Taleban insurgents rarely manage to inflict serious damage or casualties at the base, according to military reports.
Dempsey had been visiting Kabul to meet with commanders of the NATO-led force and Afghan top brass amid a surge in assaults by Afghan security personnel on their international colleagues.
A total of 10 soldiers, mostly Americans, have been killed by their Afghan allies in the past two weeks, and the attacks have caused almost one in every four coalition deaths in the war so far this month.
The total of 40 deaths so far this year amount to 13 per cent of all international coalition fatalities in 2012.
The assaults have confounded the international force, which has touted its partnership with Afghan troops as the key to withdrawing its combat troops over the next two years.
President Barack Obama, who spoke to Dempsey by phone, said on Monday the US was watching the rise in insider attacks with "deep concern", telling a White House news conference that "obviously, we have to do more".
NATO and American officers have suggested the Afghan government has failed to come to grips with the problem but Dempsey said he came away "reassured" after discussions with his Afghan counterpart, General Shir Mohammad Karimi.
"I am reassured that the Afghan leaders, military and civilian, understand how important this moment is," Dempsey said.
Taleban insurgents have taken credit for the so-called green-on-blue assaults while NATO officers say an internal review showed only about 10 per cent of them were the result of infiltration.
NATO has blamed the incidents on a mixture of cultural differences, personal vendettas and propaganda by Islamist militants.
The attacks are unprecedented in US military history and they have spawned so much mistrust that foreign troops have been ordered to be armed at all times, even within bases, officers said.
Afghan authorities have adopted more rigorous vetting of recruits and NATO has bolstered counter-intelligence but the measures have failed to stem the problem.
NATO has about 130,000 soldiers fighting an insurgency by Taleban Islamists, but they are due to pull out in 2014 and now work increasingly with the Afghans they are training to take over.
Dempsey, on the first leg of a trip to Afghanistan and Iraq, said the insider violence would not alter the timetable for withdrawal or the coalition's emphasis on cooperating with Afghan recruits.
But the growing number of attacks is likely to add to pressure in NATO nations for an early exit from the increasingly unpopular conflict, now nearly 11 years old and America's longest war.