Doctors Without Borders says it must suspend operations in part of Central African Republic after its employees there came under attack, leaving one person dead.

The aid group, also known by its French acronym MSF, said Thursday that the armed men had stopped a two-vehicle convoy in Kouki, about 50 miles (80 kilometers) north of Bossangoa.

A driver for the organization was shot and killed during the attack, which MSF said lasted about 40 minutes.

Michelle Chouinard, head of mission in Central African Republic, strongly condemned the violence and said the team was returning from a medical mission at the time.

MSF operates 17 projects across Central African Republic, where sectarian violence exploded in late 2013. Militia groups remain active across the deeply impoverished country.