On Thursday, the FBI added a former college student in Florida to its list of most wanted terrorists.
Three al-Qaida bomb plots in New York City, Manchester, England, and Norway have all been linked to Adnan Shukrijumah.
The FBI has been searching for him since 9-11.
One official even ranked him among the top five terrorists who pose a threat to the U.S.
The attacks aren't as sophisticated as 9-11, but it's the new face of terror – using Muslims living legally in the West to cause as much havoc as possible.