JERUSALEM — Israeli troops on Friday shot and killed a Palestinian teenager who also held American citizenship. The Israeli military said its forces opened fire as the teenager threw a firebomb onto a main road in the West Bank that is often used by Israeli settlers, an account that could not be verified.

Dr. Sameer Saliba, of the Palestinian Medical Complex in Ramallah, said that Orwa Abdel Wahab Hammad, 14, from Silwad, a village northeast of Ramallah, was brought to the hospital about 6 p.m. with a bullet wound to the head, and that he was dead on arrival. Other Palestinian reports put his age at 15 or 17.

Local residents said that Palestinians throwing stones clashed with Israeli soldiers in the village after Friday Prayer, but that Orwa was apparently killed hours later.

The State Department called for a speedy and transparent investigation of the killing. “We continue to urge all parties to help restore calm and avoid escalating tensions in the wake of the tragic recent incidents in Jerusalem and the West Bank,” Jen Psaki, a State Department spokeswoman, said in a statement.