KUALA LUMPUR/BEIJING (Reuters) - Angry relatives of Chinese passengers aboard a Malaysia Airlines plane missing for more than a year clashed with police in Beijing on Friday as French officials extended the search for debris on remote Indian Ocean island beaches.

Investigators on the French-governed island of Reunion have collected a piece of wing that Malaysia has said came from Flight MH370, the first real clue in one of the greatest mysteries in aviation history.

MH370, a Boeing 777, disappeared on March 8, 2014, en route from Kuala Lumpur to Beijing with 239 passengers and crew on board, most of them Chinese.

The discovery of the piece of wing, known as a flaperon, on a Reunion beach was the first piece of direct evidence that the plane had crashed into the sea but distraught family members in China said they wanted clearer answers and have accused Malaysia of withholding information.