A suicide bomber riding on a motorcycle rammed into a police truck in Pakistan's restive southwest, killing at least nine policemen and wounding seven, officials said. No one immediately claimed responsibility for the bombing, which took place on a bridge in the district of Sibi in Baluchistan province, but Baluch separatists and local militants have been blamed for previous such attacks, The Associated Press reported. Mahmood Notenzai, a local police chief, said the officers were on a routine patrol when the attack happened. The casualties have been taken to a nearby hospital, he added. Sibi is located about 150 kilometers east of Quetta, the provincial capital.