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In a letter Wednesday to congressional leaders, Attorney General Eric H. Holder Jr. said that only one of the U.S. citizens killed in drone strikes beyond war zones — Anwar al-Awlaki, who had ties to at least three attacks planned or carried out on U.S. soil — was specifically targeted by American forces. He said Mohammad and the other two Americans were not targeted in the U.S. strikes.

Pakistan’s incoming government, which will be led by former Prime Minister Nawaz Sharif, is under pressure from the public and the courts to stop U.S. drone strikes. Mr. Sharif said shortly after his party won the May 11 election that the drones violate Pakistan’s sovereignty.

Some analysts have questioned how hard Mr. Sharif would push the U.S. since the number of strikes has fallen precipitously from a peak of more than 120 in 2010 to close to a dozen so far this year. It could depend on how much he needs the U.S. in other areas.

Even if Mr. Sharif wanted to shut down the U.S. drone program, he would have to contend with the wishes of the Pakistani army, which is believed to guide the country’s policy toward the strikes.

• Associated Press writers Sebastian Abbot and Munir Ahmed in Islamabad and Lara Jakes in Washington contributed to this article.