Claim: The Boston Marathon bombing "is the fifth case" in which U.S. government officials examined individuals potentially involved in terrorism "and felt they were no threat and they went on to carry out terrorist murders."
Fact-check: Rep. Peter King says alleged Boston bombers are fifth terrorists to survive prior U.S. scrutiny
Verdict: mostly-true
Organisation: PolitiFact
Author: Louis Jacobson
Date published: 2013-04-23T00:00:00