KABUL, Afghanistan — A suicide car bomber hit a convoy of security contractors in the Afghan capital today, killing an American and a Nepalese citizen and wounding three other Americans, police said. The Taliban claimed responsibility.

Two Afghan civilians were wounded in the attack in eastern Kabul, said Najibullah Samsur, a local police chief.

Zabiullah Mujaheed, a purported Taliban spokesman, said the militant group was behind the blast.

In the southern province of Zabul, meanwhile, militants beheaded a 15-year-old boy whom they accused of spying for the Afghan government and foreign troops in the country, said Zarif Khan, the chief of New Bahar district. Authorities discovered the victim's body Wednesday, a day after he was kidnapped, Khan said.

EDINBURGH, Scotland — A former Libyan intelligence agent may have been wrongly convicted of bombing Pan Am Flight 103 over Lockerbie, Scotland, a judicial panel said Thursday, recommending that he be granted a new appeal.Abdel Basset Ali al-Megrahi, who is serving a life sentence, was the only person convicted for the bombing, which killed 259 people on the plane and 11 on the ground, including 179 Americans."The commission is of the view, based upon our lengthy investigations, new evidence we have found and other evidence which was not before the trial court, that the applicant may have suffered a miscarriage of justice," the Scottish Criminal Cases Review Commission said in a statement summarizing its 800-page report.The Court of Appeal will consider the report and decide whether an appeal is warranted.The Libyan intelligence agent has always maintained his innocence, and the commission, an independent judicial body that investigates possible miscarriages of justice, appeared to side with him.