NAJRAN: The Kingdom's border with Yemen is heavily guarded, preventing any infiltrator or smuggler crossing over, said Major General Abdul Rahman Al-Shihiri, Commander of the Frontier Guard in Najran. He made the comment at a function Tuesday of the Frontier Guards Training Center in Najran on the occasion of the King's safe return from his trip abroad for medical treatment. He said the Ministry of Interior has advanced surveillance devices including thermal cameras to detect any suspicious movement on the border.