AMSTERDAM, June 23 (Reuters) -

A Boeing 777 aircraft operate1d by Dutch airline KLM

returned to Amsterdam's Schiphol airport on Sunday

after reporting an unspecified technical problem, national air

traffic control said.

Flight KLM705 destined for Brazil's Rio de Janeiro

turned around over neighbouring Belgium, after requesting to

land as a precaution, a spokeswoman for the Dutch air traffic

control said.

It was unclear precisely what was wrong.

The aircraft was shown on FlightRadar 24 has having

returned to Schiphol Airport.