Analysts describe Shekau as a loner and a master of disguise . When he came to power , he vowed to strike back against the military . He uses Islam to recruit the disenfranchised . Hide Caption 1 of 22 Photos:
Analysts describe Shekau as a loner and a master of disguise . When he came to power , he vowed to strike back against the military . He uses Islam to recruit the disenfranchised . The U.S. has placed a bounty on his head .