UN weapons experts are due to inspect a site where reportedly poison gas killed hundreds of people in Damascus suburbs, amid calls from the West for action.
Syria agreed on Sunday to allow the inspectors to visit the site. Foreign Secretary William Hague has said the evidence to prove the Assad regime carried out a chemical attack on Syrian civilians may have been destroyed in the days since.
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A service has been held to remember the thousands of men and boys killed in the Srebrenica massacre 20 years ago.
Cloudy skies expected for most, with rain from the west becoming widespread.