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BANGKOK — Thai police said Tuesday investigators believe a man seen in security video wearing a yellow T-shirt and carrying a backpack set off the explosion at a central Bangkok shrine that killed 20 people and injured more than 100.

“The yellow shirt guy is not just the suspect. He is the bomber,” Police Lt. Gen. Prawut Thavornsiri, a police spokesman, told The Associated Press.

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Prawut earlier released several photos of the man, with and without the backpack, on a social media platform. The images were apparently taken from closed-circuit video at Erawan shrine on Monday before the central Bangkok bombing. He confirmed that the man is suspected in the bombing when contacted by The Associated Press.

Video footage posted separately on Thai media appeared to show the same man sitting on a bench at the crowded shrine, then taking off the backpack and leaving it behind as he walked away.

Prime Minister Prayuth Chan-ocha called Monday’s explosion at a busy intersection “the worst incident that has ever happened in Thailand,” and he promised to track down those responsible.