The Amber Alert search intensifies.

Investigators searching for Jennifer Hudson's missing seven-year-old nephew began receiving assistance from the FBI Saturday -- for a specific reason.

The Associated Press says that the FBI was asked to join the search effort because the young boy might have been taken out of Illinois.

William Balfour, one suspect in the possible abduction (and the double-homicide) listed by Amber Alert, is in police custody. He wrote about his alleged family ties to Jennifer Hudson on his MySpace page.