It is clear that local Mormons were the principal perpetrators.
His attempt to blame Iran as the principal perpetrator of the accident is grotesque.
Young people are the principal perpetrators of violent crime.
But many governments, especially those in Asia whose companies are the principal perpetrators, contend that the practice is not all bad.
The report by the International Trade Commission, a fact-finding agency, also named the principal perpetrators.
The failure to identify and punish the principal perpetrators, and the rumored role of foreign intelligence agencies, continue to spark controversy in Morocco.
The principal perpetrators have been identified, & their threat is presumably checked.
A chassis number the bombers had not scratched out led to the quick arrest of a principal perpetrator.
The principal perpetrators had been exposed and imprisoned, but many secrets remained buried everywhere, still waiting to be discovered.
