Airplane debris

Investigators have been examining the wing part, called a flaperon, since it was flown to a French aeronautical research laboratory near Toulouse last month. 

Malaysian authorities had already declared that the wing fragment was from the missing jet, but until now French investigators couldn't say with certitude that it was the case.

A spokeswoman in the prosecutor's office, who was not authorized to be quoted by name, denied that any new material from an airplane had been turned over to French authorities. 

Malaysia's transport minister had said hours earlier that new debris, including window material and metal, had been collected.

Other French officials with ties to the investigation Paris and Reunion also said they were unaware of any new debris.