Jehad Serwan Mostafa isn’t just another name on the FBI’s Most Wanted list—he holds the grim distinction of being the highest-ranking American fighting for al-Shabaab, the terrorist organization wreaking havoc across East Africa.

A former San Diego resident, Mostafa vanished in the mid-2000s and reemerged overseas as a key figure within the group. Federal indictments accuse him of serving as a military instructor, explosives expert, and senior leader, helping guide al-Shabaab’s operations for nearly two decades.

Now, the FBI has placed a staggering $10 million bounty on his head, warning that his actions pose an ongoing threat to U.S. national security and global stability.

This is the story of how an American citizen became one of the world’s most wanted terrorists—and why his capture remains a top priority.

This is Fugitive Files. Let’s get into it.