Authorities say the suspect, Mesut Guler, 22, the baby's father was stopped in Mexico trying to cross into that country. Mexican officials notified US Border Patrol who located the warrant for Guler's arrest and he was detained.

Guler had made previous threats that he may harm himself or the boy. Guler got into a fight with the baby's mother and took the child Tuesday afternoon from their apartment in Sunnyvale California.