THE HAGUE (REUTERS) - United Nations inspectors, in Syria to determine whether forces have used chemical weapons in the civil war, need four days to conclude their investigation and time to analyse the findings, UN Secretary-General Ban Ki-moon said on Wednesday.

"They are working very hard, under very, very dangerous circumstances," Mr Ban told a news conference in The Hague where he was attending centenary celebrations for the Peace Palace.

"Let them conclude their work for four days, and then we will have to analyse scientifically with experts and then I think we will have to report to the Security Council for any actions."