Al Shabaab claims American citizens were among the gunmen that assaulted the Westgate Mall in Nairobi, killing more than 60 people and wounding dozens more.
Somalis in the U.S. say it's possible.
"They target youth impressionable kids, lure them into Somalia," says Somali diplomat Omar Jamal.
An estimated 40 to 50 young Somali men from the Minneapolis-St. Paul area have traveled to Africa on U.S. passports to join the jihad and receive training by Al Shabaab.
The whereabouts of many are unknown.
One Twitter message identified specific Americans among the terrorists in Kenya, but the Somali government says that feed was fake.
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