Leaders of the largest Somali community in the United States say young men are still being enticed to join al-Shabab, the terror group claiming responsibility for the attack on a Kenyan mall.
Since 2007, at least 22 young men have left Minnesota to join the terrorist organization.
Unconfirmed reports that two more left earlier this month have deepened concerns.
Neither Kenyan authorities or the FBI have confirmed the involvement of Americans in the attack on Kenya's popular Westgate Mall.
An ongoing investigation in Minneapolis has found at least 21 people guilty of terrorism-related charges and raising money for al-Shabab.
Minnesota's Somali community, concentrated in the Minneapolis-St. Paul area, includes people who fled the long civil war in their east African homeland and children born in the United States. Many are now American citizens.
The movement of Somalis who've come to be known as "travelers" remains "a priority investigation for the Minneapolis office," FBI Special Agent Kyle Loven said.