A powerful blast targeting an armoured NATO convoy in Kabul killed at least eight people and wounded 28 on Wednesday, including three coalition troops, officials said in an attack claimed by the Islamic State group.

The explosion, which came during morning rush hour on a busy road near the U.S. embassy and NATO headquarters, killed “mostly” civilians, an Interior Ministry spokesman said without giving a breakdown.

Three coalition service members received “non-life threatening wounds’ but are in stable condition, a spokesman for U.S. Forces-Afghanistan said, without confirming their nationalities.

The attack was claimed by the IS via its Amaq propaganda agency.