French Foreign Minister Laurent Fabius said Tuesday that tests carried out by France on samples from Syria proved that sarin gas had been used in the country "on several occasions in a localized manner", dpa reported. "The tests demonstrate the presence of sarin in samples in our possession. With regard to these elements France now is certain that sarin gas has been used in Syria on several occasions in a localized manner," he said in a statement. Fabius said he had met earlier with Ake Sellstrom, head of a United Nations fact-finding mission into possible chemical weapons use in Syria, to present him with the results. "It would be unacceptable that those responsible for these crimes go unpunished," he said.