WASHINGTON (AP) — A pair of deadly attacks on U.S. soldiers by uniformed Afghan troops has prompted American commanders to take a fresh look at measures designed to prevent such insider attacks, the No. 2 Pentagon official said Friday.

Ashton Carter, the deputy secretary of defense, said in an interview with a small group of reporters that the review was ordered after an attack Saturday that killed three U.S. soldiers and another on Thursday that killed one. Both happened in the eastern Afghanistan province of Paktia, although details are scarce.