Head of NATO military alliance Jens Stoltenberg expressing serious concern said that tensions may escalate after an attack on Saudi oil facilities.

Talking to AFP in Baghdad, Jens Stoltenberg urged on all parties to prevent any such attacks occurring again as that can have negative consequences for whole region.

Meanwhile, Iranian President Hassan Rouhani has denied the involvement, calling attack a reciprocal act by Yemeni people.

NNR/Khokhar