The circumstances of the deaths in Bangui yesterday were unclear, Eloi Yao told AFP.
"Yesterday the city was in total chaos and this chaos lasted until the end of the night, today we are trying to understand what happened," he said.
The Chadian contingent of the African Union peacekeeping force has been accused of siding with a mostly Muslim former rebel group in the strife-torn majority Christian country.
Heavy arms fire erupted in the capital Bangui yesterday, triggering panic among residents and prompting a French force to deploy tanks near the airport, where French and African peacekeepers are based and where tens of thousands of civilians are seeking refuge from deadly sectarian violence.
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The resource-rich but impoverished country has been wracked by ever-escalating violence since a March coup by the mostly Muslim Seleka rebels.
French and African Union troops have been struggling to restore order in the notoriously unstable nation since receiving a UN mandate in early December.
The task has been complicated by accusations that soldiers from Chad, which is mainly Muslim and which has been traditionally influential in its neighbour, have been siding with the Muslim Seleka.
In yesterday's deadly clashes, the Christian vigilante groups appeared to have attacked Chadian troops in the Gobongo neighbourhood, near the city's airport, according to residents reached by telephone.
The Chadians pushed back the attack with help from Seleka fighters, several residents told AFP. The reports could not be confirmed with the AU force or French peacekeepers.