A senior police official says a suspected suicide bomber riding on a motorcycle in Pakistan's largest city prematurely detonated his explosives, killing himself and his companion.
Ahsan Umar says the two men were traveling through a residential area in the southern port city of Karachi when the blast occurred Tuesday. It is unclear where the bomber was headed. Umar is one of the top police investigators in Karachi.
The city has experienced fewer Taliban attacks than other major cities in Pakistan. But the city does have a long history of political, sectarian and ethnic violence.