NEW : Military spokesman characterizes initial reports as to an accident . Iraq : Other vehicles in the convoy did not sustain damage , spokesman says . U.S. military : A Chinook helicopter crashed 62 miles ( 100 km ) south of Basra . Twin car bombs outside a hospital kill eight , wounded 25 .
NEW : Military spokesman characterizes initial reports point to an accident . NEW : Other choppers in the convoy did not sustain damage , spokesman says . U.S. military : CH-47 Chinook helicopter crashed 62 miles ( 100 km ) west of Basra . Twin car bombs outside Baghdad hospital kill eight , injure 25 .