Anwar al-Awlaki

A report from a British-based think tank that studied the convictions of 171 al-Qaeda-related cases finds alarming news.

FOX's Catherine Herridge reports from Washington in our ongoing series on national security:

Securing America.

The report by the Henry Jackson Society found most operatives are American citizens.  They're relatively young - under 30.  British investigator Robin Simcox:

(Simcox) "We had computer programmers, software engineers, pharmacists, financial analysts.  They've not been marginalized by a system, they've passed through it."

While the number of homegrown cases peaked in 2009 - the same year as the Ft. Hood massacre - investigators say the trend line is unpredictable.

In Washington, Catherine Herridge, FOX News Radio.