OUAGADOUGOU - Four people including three foreigners are missing after an armed ambush on an anti-poaching patrol in eastern Burkina Faso on Monday, four local security sources said.

The attackers struck during the day on a road leading to the vast forested reserve of Pama. Those missing include a member of the Burkinabe armed forces, two Spanish citizens and an Irish national who worked for conservation organisations, two of the sources said.