The NATO commander in Afghanistan, Gen Stanley Mc Chrystal has publicly apologised over the death of twenty seven civilians in an air strike in Daykundi province.In a video statement, he said he had spoken to Afghan President Karzai and apologised to him for the incident. Gen. McChrystal said that he had instituted a thorough investigation to prevent such incidents happening again. Meanwhile, eight persons were killed and sixteen others injured when a bomb mounted on a bicycle exploded in Lashkargah, capital of the Helmand province. In another incident, five foreign soldiers were injured today after their vehicle was hit by a bomb in Qalat, capital of Zabul province.