UN chemical weapons inspectors in Syria are investigating seven cases of alleged chemical or biological weapons use, including three incidents that occurred after the August 21 attack.
The United Nations said inspectors had returned to Syria on Wednesday to investigate the new sites, and would finalise their work on Monday. A report into their findings is to be issued in late October.
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Chancellor George Osborne will seek to reassure financial markets on Monday morning following Britain's decision to leave the EU.
In his first outing since the referendum result, the lead Leave campaigner has outlined his vision for a post-Brexit Britain.