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Syria chemical attack 'undeniable' - John Kerry

26 August 2013 Last updated at 21:05 BST

US Secretary of State John Kerry has condemned what he called "the staggering scale" of death and injury caused by chemical weapons in Syria.

Speaking in a televised statement on Monday, he said the evidence was "screaming at us" that such weapons had been used in Syria, and that the government was responsible.

"With our own eyes, we have all of us become witnesses," he said.