DUBAI, (Reuters) – Saudi Arabia has regained control  of territory seized by Yemeni rebels in an incursion last week,  a senior official was quoted as saying, as the kingdom becomes  more entangled in conflict to its south.

Saudi Arabia launched air strikes on rebels in northern  Yemen last week after Shi’ite Muslim insurgents crossed the  border into the kingdom and said they had taken control of an  area called Jabal Dukhan.

The world’s top oil exporter has become increasingly anxious  about instability in Yemen, which is facing a Shi’ite insurgency  in the north, separatist sentiment in the south and a growing  threat from resurgent al Qaeda fighters.

“The situation is calm … especially in Jabal Dukhan, of  which full control has been regained,” Prince Khaled bin Sultan  bin Abdul-Aziz, assistant minister for defence and aviation,  said on Saturday, the Saudi Press Agency (SPA) reported.

Prince Khaled said three members of the Saudi security  forces were killed and 15 wounded in fighting on the  Saudi-Yemeni border, SPA said.

Four Saudi soldiers were missing, Prince Khaled said, but he  denied they had been taken prisoner. He said Saudi security  forces had arrested several rebels.