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The US President may have been influenced by the British Parliament's anti-war vote.
Mr Cameron said that he understood and that the "government will act accordingly".
NATO-led foreign troops are due to leave to leave the country by the end of 2014.
The Syrian government has accused Washington of seeking to frame the regime to justify military action.
Last week the Syrian opposition claimed that some 1,300 people were killed in a chemical weapon attack.
Consumption of Vitamins A, C and E also helped lower risk of developing bladder cancer.
Two blasts at Sunni mosques in the northern port of Tripoli killed 42 and wounded at least 400 people.
Russia says it has information which disputes Syrian rebel accounts of the chemical attack.
The military exercises, the third this year, come as relations between the two Koreas appear to thaw.
Although there have been no reports of attacks on non-Egyptians, governments are not taking any chances.
