He said on Monday that access must include interviews and examination of witnesses, victims and medical personnel and the conduct of post-mortem examinations.
After months of negotiations, a 20-member UN team led by Swedish chemical weapons expert Ake Sellstrom arrived in Damascus on Sunday to investigate three sites where chemical weapons attacks allegedly occurred, the village of Khan al-Assal just west of the embattled northern city of Aleppo and two other locations being kept secret for security reasons.
Diplomats and chemical weapons experts have raised doubts about whether the experts will find anything since the alleged incidents took place months ago.
The mandate for the investigation is also limited: The team will report on whether chemical weapons were used, and if so which ones, but it will not determine the responsibility for an attack. This has led some commentators to question the value of the investigation.
Ban said that if the UN team reports that chemical weapons were used, it is up to the international community to determine what course of action should be taken to prove this, first of all, (determine) accountability, and what needs to be done. The secretary-general reiterated that if confirmed, the use of chemical weapons by any side under any circumstances must be held accountable and would constitute an international crime.
He said that the serious security situation in Syria will undoubtedly affect the mission's activities in Syria and stressed that the government and others must ensure their safety. He expressed appreciation for the assurances he has received on their safety and security.
At the same time, Ban reiterated that "in order to credibly establish the facts, the mission must have full access to the sites of the alleged incidents to undertake the necessary analyses and to collect samples."
Syria is said to have one of the world's largest stockpiles of chemical weapons, including mustard gas and the nerve agent sarin, though it has never admitted possessing such weapons.


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