Homegrown rebels have done most of the fighting against the Syrian government troops. But Islamist militants from abroad, including some with links to al-Qaida, are now joining the fight against the government in growing numbers.
The local rebels are not pleased with this development, and there is growing tension between the groups that share a desire to oust President Bashar Assad but little else.
Until a few weeks ago, the border crossing at Bab al-Hawa on Syria's northern frontier with Turkey was the site of a training camp for a militant Islamist group.
From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
AUDIE CORNISH, HOST:
And I'm Audie Cornish. Republican presidential hopeful Mitt Romney admits he could've used more elegant language, but he's not backing down. Romney was secretly recorded speaking at a fundraiser in May and his comments were publicized yesterday by the liberal magazine, "Mother Jones." Here he is telling wealthy backers that President Obama has a built-in base of support.
Some conservatives have denounced Romney's remarks. The "Weekly Standard's" Bill Kristol called them arrogant and stupid. In the New York Times, David Brooks wrote that it shows Mitt Romney doesn't understand the country or its culture. But others, such as radio personality Rush Limbaugh, have come to the candidate's defense.