(CBS News) DAMASCUS - In the midst of civil war, Syria is anxious to convince the world that the fighters they're battling are al Qaeda-linked terrorists.
On Thursday, we were invited to meet some of those fighters by Khaled Mahjoub, a Syrian-American businessman with close ties to the Assad government.
We drove through Damascus to a military jail, where prison officials told us 50 percent of the opposition terrorists were foreign religious extremists.
But when the men were brought in, we discovered they were all Syrians: a builder, a metal worker and a farmer.
All three claimed they were fighters whose units had been recently taken over by Islamic fundamentalists, who then made them commit atrocities.
Shadi Idriss told me they videotaped him murdering villagers to post on Facebook. With a room full of government and military observers, who knows what the truth is.
But we could find no trace of any such video.
And when we asked the men -- all accused of violent acts against the Syrian army -- how they were managing in Syria's notorious prison system, they took off their shirts and said "very well."
The men may not be real al-Qaeda-linked extremists. But no one disputes they're out there.
Their official websites proudly post video of breathtaking cruelty. In one instance, three truck drivers transporting fruit and vegetables are shot summarily at a rebel checkpoint for being from the wrong religious group.
The last thing the U.S. wants is to empower men like this.
The critical question is how many of these extremist fighters are there. It's hard to tell. Best estimates suggest between 15,000 and 20,000 of a total fighting force of say 100,000. But they are extremely effective more than their numbers suggest because they're so much better trained and equipped.