WASHINGTON — The Obama administration is debating a more robust intervention in Syria, including possible American airstrikes, in a significant escalation of its weeks-long military assault on the Islamic extremist group that has destabilized neighboring Iraq and killed an American journalist, officials said Friday.

While President Obama has long resisted being drawn into Syria’s bloody civil war, officials said recent advances by the Islamic State in Iraq and Syria had made clear that it represents a threat to the interests of the United States and its allies. The beheading of James Foley, the American journalist, has contributed to what officials called a “new context” for a challenge that has long divided the president’s team.

Officials said the options include speeding up and intensifying limited American efforts to train and arm moderate Syrian rebel forces that have been fighting both ISIS as well as the government of President Bashar al-Assad. Another option would be to bolster other partners on the ground to take on ISIS, including the Syrian Kurds.

But American officials said they would also take a look at airstrikes by fighter jets and bombers as well as potentially sending Special Operations forces into Syria, like those who tried to rescue Mr. Foley and other hostages on a mission in July. One possibility officials have discussed for Iraq that could be translated to Syria would be a series of unmanned drone strikes targeting ISIS leaders, much like those conducted in Yemen, Somalia and Pakistan.