Nuradin Abdi was convicted in 2007 of planning to blow up an Ohio shopping mall.
A suspect is in custody amid reports of homegrown terrorism.
Iyman Faris was convicted in 2003 of planning to blow up the Brooklyn Bridge.
Christopher Paul was convicted in 2008 of conspiring to use explosives against targets in the U.S. and Europe.
All three terrorists worshiped and socialized at a small mosque in Columbus, Ohio, and, according to David B. Smith, an attorney for Faris, were part of a larger group of jihadists and extremists who frequented the mosque.
The FBI now is investigating reports of links to that same mosque by Muslim-convert Abdulhakim Muhammad who allegedly shot and killed one soldier Monday and critically wounded another in a drive-by attack on a Little Rock, Ark., recruiting station, ABC News has learned.