PARIS, June 7 (Xinhua) -- The foreign ministers of France and Britain, respectively Bernard Kouchner and William Hague, called Sunday night here for a "credible and transparent" investigation into the Israel's raid on humanitarian flotilla bound to Gaza. The two ministers insisted that it's necessary to take "credible and transparent" international investigation into Israeli operation on May 31 that killed nine activists. "It should be internationally enforced, the investigation, with several countries involved," Kouchner said. "We think it's important" to take this investigation, and "we believe it should at least have an international presence" in it, Hague said. On the same day, French President Nicolas Sarkozy suggested Israeli Prime Minister Benjamin Netanyahu in a telephone talk to accept "an impatial investigation" on its raid to aid ship heading to Gaza.