US investigators now believe that a blast that crippled a French supertanker off the coast of Yemen this week was terrorism, reversing an initial assessment that the explosion could have been an accident, two senior US officials said Thursday. The officials, speaking to AFP on condition of anonymity, said they were revising their position based on preliminary reports from US, French and Yemeni investigators who are now on the stricken vessel looking into the blast. "There are now lots of indications that it was caused by some bad people, terrorists," one official said, stressing, however that the probe had not...