Fires that broke out from four Mitsubishi Motors Corp. vehicles in separate incidents over the weekend are probably not linked to structural defects, the automaker said Wednesday.

The vehicles involved in two of the incidents -- a Pajero sport utility vehicle that caught fire Saturday on an expressway in Saitama Prefecture and a Chariot Grandis minivan that caught fire in the same prefecture the following day -- had been repaired by the automaker in line with past recalls.

The 1991 Pajero was recalled in 1996 and the 2001 model Chariot Grandis was recalled last year, both for defective front brakes.