US aircraft patrolled the skies over an eastern Afghan town on Monday after unidentified attackers fired a volley of rockets near a US outpost, officials said. No deaths or injuries were reported.Elsewhere, two US special operations soldiers were slightly injured on Sunday when their vehicle hit an explosive device, possibly a land mine, between the eastern cities of Asadabad and Jalalabad, the US military said.Six rockets exploded on Monday near the airport in Khost where US troops have a base, according to Mohammed Khan Gorbuz, spokesman for the provincial Governor. After the attack, Gorbuz said American airplanes were spotted patrolling the skies but did not fire. Such attacks have been common in Khost area this year. Al Qaeda and Taliban fugitives are still in the area, and warlord Bacha Khan Zadran has been fighting the provincial Governor’s forces for control of the province, which borders Pakistan.On Wednesday, two rockets exploded in an open field near Khost airport in a similar attack.US military officials have said that between 500 and 1,000 US troops have been sent recently to two bases in Khost to augment US special operations teams.The move was taken to bolster the American military presence in an area where large numbers of Al Qaeda and Taliban fighters are believed to be trying to regroup.