Shahi Koto: Pakistani authorities say they have arrested 35 suspects in connection with a bombing that killed three US soldiers and four other people, including three schoolgirls, in northwest Pakistan.

Two more US soldiers were wounded, along with about 100 other people, mostly students at an adjacent school.

The killings Wednesday were the first known US military fatalities in nearly three years in Pakistan's Afghan border region, drawing attention to a training program officials rarely discuss.

Police official Naeem Khan told The Associated Press on Thursday "about 35 suspects are in our custody."

Khan said authorities have concluded the blast was caused by a suicide car bomb, not a roadside bomb detonated by remote control as previously reported.