Thai police have released a sketch of the key suspect in the investigation into the Bangkok bomb blast that killed at least 20 people.
The man was shown in CCTV footage leaving a backpack at the scene, checking a phone and then casually walking away before the blast.
The sketch released by police shows a man with medium-length black hair, a beard and glasses. It’s unclear from the sketch if he is Thai or a foreigner.
Police say others could be behind the blast, although the man in the sketch is a suspect.
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