American forces are “ready” to launch strikes on Syria if President Barack Obama chooses to order an attack, US Defence Secretary Chuck Hagel says.
“We have moved assets in place to be able to fulfil and comply with whatever option the president wishes to take,” Mr Hagel told the BBC.
US Secretary of State John Kerry has said there is “undeniable” proof that Syria had used chemical weapons.
The UK Parliament is to be recalled on Thursday to discuss possible responses.
Britain is considering military responses to the attack.
Prime Minister David Cameron, who has cut short his holiday and returned to London, said MPs would vote on a “clear motion” on the crisis.
Syria’s allies, Russia and China, have stepped up their warnings against military intervention in Syria, with Moscow saying any such action would have “catastrophic consequences” for the region.
Meanwhile Syrian Foreign Minister Walid Muallem said he rejected “utterly and completely” claims that Syrian forces had used chemical weapons.
His government has blamed rebel fighters for the suspected chemical attack, which took place on 21 August near the Syrian capital Damascus, and reportedly killed more than 300 people.
On Monday, United Nations chemical weapons inspectors were fired on while investigating one of the five alleged attack sites around Damascus.
‘We are prepared’
Mr Hagel said the US Department of Defence had provided President Obama with “all options for all contingencies”.
“He has seen them, we are prepared,” he told the BBC’s Jon Sopel, adding: “We are ready to go.”
Mr Hagel said that intelligence currently being gathered by the UN inspectors would confirm that the Syrian government was responsible for the chemical attacks last week.
“I think it’s pretty clear that chemical weapons were used against people in Syria,” he said.
UN chemical weapons inspectors spent nearly three hours in the suburb of Muadhamiya in western Damascus on Monday.
“I think the intelligence will conclude that it wasn’t the rebels who used it, and there’ll probably be pretty good intelligence to show is that the Syria government was responsible. But we’ll wait and determine what the facts and the intelligence bear out.”
Mr Hagel’s remarks come a day after Mr Kerry accused the Syrian government of destroying evidence of its chemical weapons use in Damascus by shelling the area.
He said his administration had additional information about the attacks that it would make public in the days ahead. Mr Kerry described the assaults as a “moral obscenity”.
“What we saw in Syria last week should shock the conscience of the world. It defies any code of morality,” Mr Kerry said at a news conference on Monday.
“Make no mistake, President Obama believes there must be accountability for those who would use the world’s most heinous weapons against the world’s most vulnerable people.”
The UN Security Council is divided, with Russia and China opposing military intervention and the UK and France warning that the UN could be bypassed if there was “great humanitarian need”.
But Russian President Vladimir Putin said there was no evidence that an attack had taken place or who was responsible.
The UN says more than 100,000 people have been killed since the uprising against President Assad began more than two years ago. The conflict has produced more than 1.7 million registered refugees.
Source: BBC News