The Cambodian leader, Hun Sen, has flown to Siem Riap for an unscheduled meeting with King Norodom Sihanouk.

Correspondents say the two men are thought to have discussed a dispute over Cambodia's newly-formed Constitutional Council,which is threatening the credibility of the elections scheduled for the end of July.

Representatives of the royalist party lead by the King's son, Prince Norodom Ranariddh, have been boycotting the Constitutional Council because they say it is biased in favour of Hun Sen's Cambodian People's Party.