http://news.yahoo.com/us-official-13-americans-killed-afghan-bombing-132131947.html
KABUL, Afghanistan (AP) — A Taliban suicide bomber rammed a van into an armored NATO bus Saturday in Kabul, killing 13 American troops and four Afghans, U.S. and Afghan officials said, in the deadliest attack on coalition forces in more than two months.
The explosion, which occurred as the convoy was passing the American University, sparked a fireball and littered the street with shrapnel. Heavy black smoke poured from burning wreckage at the site.
The armored personnel carrier, known as a Rhino was sandwiched between of a convoy of mine-resistant military vehicles traveling on a four-lane highway frequently used by NATO forces in a southwestern section of the city.
NATO said 13 service members were killed, but a U.S. official confirmed they were all Americans. The official spoke on condition of anonymity because of the sensitivity of the issue.