The UK Foreign and Commonwealth Office has just updated their advice with this amendment :-
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The US Embassy in Manila has issued a message advising of a threat against US citizens in Manila, particularly in the Pasay City neighbourhood. The threat is considered to be in effect until 10 October 2012. Any attack could be indiscriminate and we advise British nationals to exercise particular caution and extra vigilance in places frequented by expatriates and foreign nationals.
( http://www.fco.gov.uk/en/travel-and-...ia/philippines ).