A file picture dated 23 February 23, 2005 shows the pier at Kuwait's largest refinery of Al-Ahmadi, just north of Al-Shuaiba, 30 kms from Kuwait City. AFP PHOTO/YASSER AL-ZAYYAT ABU DHABI: State-run Kuwait Petroleum Corp and all affiliated firms remain on alert, state news agency KUNA said Wednesday, three weeks after Saudi Arabia and Arab allies began military strikes against Houthi militias in Yemen.