Senate and House panels hold hearings on homegrown terrorists and America military . Authors say study shows dimensions of the threat . American military is a target for Islamist extremist plots at home and abroad , they say . Authors : House should also study threat from Islamist terror groups of left , right .
House and Senate panels hold hearings on homegrown terrorists and U.S. military . Authors say study shows dimensions of the threat . American military is a target for Islamist extremist plots at home and abroad , they say . Authors : Congress should also study threat from non-Islamist terror groups of left , right .