The online video allegedly shows one of the brothers shooting dead a cousin.

Saudi security forces engaged in a gunbattle with two brothers suspected of belonging to the militant group Islamic State of Iraq and Sryia (ISIS), the Interior Ministry said on Saturday.

The shoot-out followed the distribution of a video online this week allegedly showing one of the brothers shooting dead a cousin, who was a member of the Saudi security forces.

The ministry said one of the brothers Abdul Aziz al-Anzi, 18, was killed, while his brother Saad, 21, was arrested and wounded during the shoot-out in the desert province of Ha’il.

The brothers are accused of killing their cousin, Madous Fayez al-Anzi, on Thursday, which marked the first day of Eid al-Adha.

They are also suspects in shootings that killed two civilians outside a police station and a soldier in separate incidents on Thursday.

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