Pakistan on Thursday conceded that a blast on a bus carrying Chinese workers, which killed nine of them, could have been caused by explosives, after having initially termed the incident an accident.Information Minister Fawad Chaudhry tweeted that initial investigations of Wednesday's incident have "confirmed traces of explosives" and that terrorism has not been ruled out.A total of 13 people, including four Pakistanis, were killed in the incident that involved a bus carrying workers of the Dasu hydropower project in Khyber Pakhtunkhwa province.Pakistan's Foreign Ministry had initially claim…READ FULL ARTICLE