NEW : Afghanistan 's Nangarhar province borders Pakistan 's loosely governed tribal region . 3 border police officers killed in suicide-bombing attack , Afghan government says . Strike hits Nazyan 's Nazyan , near Nangarhar province border , official says . Attack happened Wednesday Wednesday evening in province 's Nazyan district .
NEW : 3 border police officers killed in suicide-bombing attack , Afghan government says . Strike hits Nazyan 's Nazyan , near Nangarhar province border , official says . Attack happened Wednesday Wednesday evening in province 's Nazyan district .