NATO chief 'extremely concerned' after attacks on Saudi NATO chief Jens Stoltenberg says he was "extremely concerned" about escalating tensions following strikes on Saudi oil facilities at the weekend, accusing Iran of "destabilising" the region. Speaking to AFP in Baghdad, Stoltenberg's comments were his first on the strikes on two major Saudi oil facilities, which were claimed by Yemen's Huthi rebels but which both Washington and Riyadh have blamed on Tehran. IMAGES AND SOUNDBITES