Last week, FBI agents arrested Matthew Ryan Buquet after a grand jury charged him with mailing threatening communication to a senior judge in the U.S. District Court for the Eastern District of Washington state.

CNN: Threatening letters to Bloomberg test positive for ricin

"The CWS now recommends that the uncle takes over care of the two Indian children in the child welfare case and a Stavanger District Court will make the final decision on 17 April, " the agency's communication adviser Thomas Bore Olsen said in a statement on Thursday evening.

BBC: Norway to hand over Indian children in custody row