Militants in Afghanistan set off a suicide blast on Wednesday morning and stormed a construction company near the airport in Jalalabad, the capital of eastern Nangarhar province, killing at least 16 people, officials said.

The dawn assault triggered an hours-long gunbattle with local guards, drawing in U.S. forces to assist the Afghan troops in the shootout. Along with the 16 killed, nine people were also wounded in the attack, according to Attahullah Khogyani, the provincial governor's spokesman.