BANGKOK—Police in Thailand released a sketch Wednesday of the man they believe carried out this week’s deadly Bangkok bombing, and offered a 1 million baht ($28,000) reward for help leading to his arrest. But apart from a rough portrait, authorities have few solid leads — they don’t know the bomber’s motive, where he’s from or if he’s still in the country.
The sketch was released after grainy security video footage showed the man leaving behind a backpack just 15 minutes before the blast at a popular downtown shrine. Police said the picture was also partly based on a description provided by a motorcycle taxi driver believed to have given him a ride on the night of the Monday blast.