BOSTON (AP) – The FBI says it has identified the kidnapping suspect who calls himself Clark Rockefeller as a German man who came to the U.S. as a youth and later took on several aliases.

The FBI told reporters it pulled fingerprints from early 1980s immigration documents concerning Christian Gerhartsreiter.

The prints match those taken from Gerhartsreiter around the time of his Aug 2 arrest in Baltimore.

Earlier this week, California authorities identified Rockefeller as Gerhartsreiter but didn’t provide forensic evidence.

Gerhartsreiter is accused of kidnapping his daughter off a Boston street in an elaborately planned abduction that involved hiring two people to drive them to New York.

Authorities also are seeking to question him about a California couple’s disappearance.

AP-ES-08-15-08 1517EDT