French investigators studying debris recovered from a downed EgyptAir plane claim to have found traces of the explosive material TNT.
Further analysis of the wreckage, however, has been blocked by Egyptian judicial authorities, French newspaper Le Figaro reports.
Egypt authorities have reportedly demanded a joint report be written alongside France validating the findings, however France has declined, citing the need for more in-depth study.
The Egypt-led investigation committee denies obstructing the French investigation, Reuters reports.
EgyptAir flight MS804 crashed into the Mediterranean sea while en route to Cairo from Paris on May 19, killing 66 passengers.
The cause of the crash is not known, however a flight data recorder has revealed there was smoke in the lavatory and avionics bay shortly before the flight went down.
One segment of wreckage has also shown signs of high-temperature damage as well as soot.