By Julian Pecquet - 08/28/13 08:48 PM EDT
He said the inspectors would need four days to investigate the attack on Damascus suburbs and then additional time to analyze their findings.
The Obama administration has said it doesn't need to wait because it already has solid evidence that Syrian President Bashar Assad's regime is behind an Aug. 21 poison gas attack that rebels say killed more than 1,000 people.
“The U.N. investigation will not determine who used these chemical weapons, only whether such weapons were used — a judgment that is already clear to the world,” Secretary of State John Kerry said Monday. “The regime’s belated decision to allow access is too late, and it’s too late to be credible.”