Paris - A French soldier allegedly killed two fellow Foreign Legion members and a peacekeeper from Togo in an unexplained shooting Tuesday in Chad, French Defence Minister Herve Morin said late Tuesday in Paris.

The suspected killer was being sought by Chadian security forces.

The three legionaries were reportedly members of a French regiment based with European EUFOR troops in Abeche, Chad. The slain Togolese soldier was assigned to the United Nation's MINURCAT peacekeeping mission.

There was no immediate explanation or motive for the shooting.

Several thousand foreign troops are stationed in northern Chad to protect refugees from neighbouring Sudan.