NATO: 3 US Contractors Killed In Afghan Suicide Bomb Attack

British soldiers leave the site of a suicide attack in the heart of Kabul, Afghanistan, Saturday, Aug. 22, 2015. The suicide car bomber attacked a NATO convoy traveling through a crowded neighborhood in Afghanistan's capital Saturday, killing at least 10 people, including three NATO contractors, authorities said. (AP Photo/Massoud Hossaini)

KABUL, Afghanistan—NATO says a suicide car bombing targeting a convoy in Afghanistan killed three American contractors.

Authorities say the blast Saturday in the Afghan capital, Kabul, killed at least 12 people and wounded 66.

NATO did not name the dead contractors in its statement.

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The attack struck near the private Shinozada hospital in the capital’s Macrorayan neighborhood just as schools were letting out.

The Taliban denied carrying out the attack. However, they have stepped up their assaults on Afghan security forces since U.S. and NATO troops ended their combat mission in the country last year.