Rockets hit border areas in Saudi Arabia from Yemen's rebel-held north on Wednesday, the first day of a temporary ceasefire proposed by the kingdom, a defence ministry official said.

"At 10:00 am (0700 GMT) on Wednesday, rockets fell on the regions of Najran and Jazan, and (rebel) Huthi militia sniper fire was detected, but there were no casualties," said the official quoted by the Saudi Press Agency.

Saudi armed forces "practised self-restraint as part of its commitment to the humanitarian truce which was decided by coalition forces," the official said.