David Cameron has discussed Syria with Barack Obama by telephone as Britain and the US consider intervention, SIA reports citing BBC News.
The UK's response will be discussed at a National Security Council (NSC) meeting later, while the US has said its forces are "ready to go".
The prime minister said on Tuesday the world could not "stand idly by" as the Syrian government used chemical weapons against its own people.
But Syria's foreign minister denied his government had used chemical weapons.
The government blamed opposition fighters for last Wednesday's alleged chemical attack near Damascus, which reportedly killed more than 300 people.
UN weapons inspectors are to return to the site of the suspected attack later.
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