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In a warning last summer to the regime of Syrian President Bashar al-Assad, President Obama said a 鈥渞ed line鈥� would have been crossed if chemical weapons were used against rebels fighting there, and he promised 鈥渆normous consequences鈥� if that were to happen.

According to news reports Thursday and a direct statement by the White House, that red line clearly has been crossed with chemical weapons used to kill between 100 and 150 people. But the White House was vague about its immediate response, other than to note it would "increase the scope and scale of assistance" to the anti-Assad rebels.

鈥淔ollowing a deliberative review, our intelligence community assesses that the Assad regime has used chemical weapons, including the nerve agent sarin, on a small scale against the opposition multiple times in the last year,鈥� White House聽Deputy National Security Adviser Ben Rhodes said in a statement. 鈥淥ur intelligence community has high confidence in that assessment given multiple, independent streams of information.鈥�

鈥淭丑别 intelligence community estimates that 100 to 150 people have died from detected chemical weapons attacks in Syria to date; however, casualty data is likely incomplete,鈥� Mr. Rhodes said, indicating that there may well be more casualties from chemical weapons.

鈥淭丑别 body of information used to make this intelligence assessment includes reporting regarding Syrian officials planning and executing regime chemical weapons attacks; reporting that includes descriptions of the time, location, and means of attack; and descriptions of physiological symptoms that are consistent with exposure to a chemical weapons agent,鈥� Rhodes said.

In his earlier warning to Syria, Obama had said this: 鈥淲e have been very clear to the Assad regime but also to other players on the ground that a red line for us is we start seeing a聽whole bunch of chemical weapons聽being moved around or utilized. There would be enormous consequences if we start seeing movements on the chemical weapons or use, that would change my calculations significantly.鈥�

鈥淎 whole bunch of chemical weapons鈥� and 鈥渃hange my calculations significantly鈥� are phrases designed for maximum flexibility.

But Obama has been under increasing pressure to do more about the situation in Syria, which has seen, according to the latest UN estimate, at least 93,000 people killed 鈥� most of them civilians 鈥� and thousands more turned into refugees trying to escape the fighting.

In recent weeks, Britain, France, Israel, and the United Nations all have asserted that Assad regime forces had used chemical weapons. Domestic political pressure has been mounting as well.

鈥淚t is long past time to bring the Assad regime鈥檚 bloodshed in Syria to an end,鈥� Buck Brendan, spokesman for House Speaker John Boehner, said in a statement Thursday. 鈥淎s President Obama examines his options, it is our hope he will properly consult with Congress before taking any action.鈥�

In a joint statement, Senators John McCain (R) of Arizona and Lindsey Graham (R) of South Carolina, who are pushing for the US and its allies to establish a no-fly zone in Syria, said, 鈥淲e cannot afford to delay any longer.鈥�

鈥淎ssad is on the offensive with every weapon in his arsenal and with the complete support of his foreign allies,鈥� they said. 鈥淲e must take more decisive actions now to turn the tide of the conflict in Syria.鈥�

More to the point for a Democratic President in the White House, former President Bill Clinton this week sided with that view, according to several reports from a private meeting at which Senator McCain and Mr. Clinton spoke.

鈥淪ome people say, 鈥極kay, see what a big mess it is? Stay out!鈥� I think that鈥檚 a big mistake,鈥� Clinton said.

鈥淚 agree with you about this,鈥� Clinton told McCain during an event for the McCain Institute for International Leadership in Manhattan Tuesday night, Politico.com reported. 鈥淪ometimes it鈥檚 just best to get caught trying, as long as you don鈥檛 overcommit.鈥�

At this point, the Obama administration is being less than specific in its response the 鈥渞ed line鈥� report about chemical weapons killing rebel fighters and likely civilians in Syria.

鈥淭丑别 Assad regime should know that its actions have led us to increase the scope and scale of assistance that we provide to the opposition,鈥� Ben Rhodes at the White House said. 鈥淭丑别se efforts will increase going forward.鈥�

鈥淭丑别 United States and the international community have a number of other legal, financial, diplomatic, and military responses available,鈥� Rhodes said.聽鈥淲e are prepared for all contingencies, and we will make decisions on our own timeline.鈥�