Crash investigators concentrated tonight on the possibility that a Kenya Airways jetliner lost power in both engines during a storm and tried to glide back before plunging nose first into a Cameroon swamp 12 miles from the airport.

A Kenya Airways jetliner that plunged in a central African swamp was broken into pieces no bigger than a car door, a searcher disclosed today.

Signs have been found of a Kenya-bound flight that crashed in Cameroon with 114 people aboard, an aviation official said today.