ISLAMABAD—The daughter of Afghanistan’s ambassador to Pakistan was abducted in the middle of the Pakistani capital of Islamabad by unknown assailants, held for several hours and brutally attacked, officials in both countries said Saturday. No one has been arrested in connection with Friday’s assault on Silsila Alikhil, 26. The Afghan foreign ministry issued a statement demanding a quick investigation, saying she was “severely tortured.” A hospital medical report, seen by The Associated Press, said she suffered blows to her head, had rope marks on her wrists and legs, and was badly beaten. There was a suspicion that she had several broken bones and X-rays were ordered, the report said. The report also said her abductors held her for over five hours and that she was brought to the hospital in Islamabad by police. According to Pakistan’s Foreign Ministry, the Afghan embassy said that Alikhil’s assault occured as she was a …