Pilgrims wrapped in white garments queued for a document check at Riyadh’s international airport when a powerful explosion brought chunks of the ceiling down on their heads, footage released by Saudi authorities shows, according to AFP.

Gate workers can be seen diving under their desks as passengers scramble away from the direction of the blast, in dramatic security camera footage released by the Saudi media ministry, showing the moment of the deadly strike on Saturday that killed 13 people and wounded hundreds.

Smoke and debris cloud the images, leaving only a sudden fire visible, while some blurry figures appear too shocked to flee.

Saudi authorities have warned of potential legal consequences against witnesses speaking out about strikes and have restricted media from accessing attack sites to independently report on them.