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Britain is planning to join forces with America and prepare its Royal Navy vessels against Syria, The Daily Telegraph is reporting.
Government sources said talks between the Prime Minister and international leaders, including Barack Obama, would continue, but that any military action that was agreed could begin within the next week.
The possibility of such intervention will provoke demands for Parliament to be recalled this week.
A former Liberal Democrat leader has called for "sharp" action against the Syrian regime today, as Downing Street said today that it has "not ruled out" recalling Parliament to discuss military action in the country.
Writing in The Times (£), Paddy Ashdown said that although he would “hate” an action that was not sanctioned by the United Nations, it was better than to let that body be further damaged by failure to respond to what could be the most “egregious breach” of human rights since it was founded.
Lord Ashdown added: "Action taken with the aim of underpinning international law, even if it in the end doesn’t, is better, it seems to me, than no action with the certain consequence of undermining it.
Downing Street said it has "not ruled out" recalling Parliament to discuss military action in Syria but added it could need to "take action very swiftly" in the Middle East.
After Labour urged David Cameron to consult MPs ahead of any decision on Syria, a No. 10 spokesman said:
US President Barack Obama has discussed "possible responses by the international community" to Syria with French President Francois Hollande.
The White House said they agreed to "continue to consult closely" after accusing the Assad regime of using chemical weapons against its own people last week.
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.
Mr Hague said tomorrow's UN inspection of the Damascus site, five days after the alleged attack, may find a "compromised" area.
Shadow foreign secretary Douglas Alexander has said the Prime Minister must make a case for military action over Syria in Parliament should the crisis reach that point.
Russia has urged the United States not to pursue unilateral military action in Syria, warning it could have a "devastating impact" on the security situation in the Middle East.
David Cameron and French president Francois Hollande discussed Syria in a phone call this morning and agreed a "firm response" is needed over the situation, Number 10 has said.
A senior US senator has called for the country to act with other nations in the wake of an alleged chemical attack atrocity in Syria to avoid getting into a "general military operation".
As the Russian foreign ministry urged the US against repeating the "mistakes of the past", Democrat Jack Reed said any American response must be international and not unilateral.
Russia's foreign ministry has welcomed Syria's decision to grant UN inspectors access to the site of an alleged chemical weapons attack near Damascus.
The ministry also warned against any "hurried conclusions" in assigning blame for the incident.
Latest ITV News reports
The international community has called for the alleged chemical attack to be investigated by UN inspectors, swiftly.