Story highlights One American was killed in an attack on a NATO coalition base in Afghanistan on Friday

Taliban claims responsibility in suicide bombing at police academy and attack at coalition base, spokesman says

Elsewhere, a truck explodes on a main road, killing 15 people

Kabul, Afghanistan (CNN) More than 50 people -- including 27 students at a police academy and one U.S. service member -- were killed in three separate attacks in Afghanistan on Friday, according to U.S. and Afghan officials.

The American was killed when a NATO coalition base in the capital city, Kabul, was attacked, a defense official told CNN. Another official told CNN's Barbara Starr that nearly 20 people of varying nationalities were wounded.

Separately, U.S. Army Col. Brian Triebus said in a statement that eight Afghan civilian contractors and four insurgents were also killed in that incident. Triebus also said a coalition service member was killed, but he did not give the nationality of that person.

The attack on the coalition base, Camp Integrity, took place at 10:15 p.m., beginning with an explosion from a suspected suicide bomber followed by insurgents with small arms. The base houses U.S. and coalition troops that help train Afghan forces.

There are approximately 9,800 U.S. troops in Afghanistan.

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