BANGKOK—Two small improvised bombs exploded outside a luxury shopping mall in central Bangkok on Sunday night, panicking shoppers in the Thai capital and slightly injuring one man.

Police said the devices were fitted with a timer set for 8 p.m., one of the busiest times in the area around the Siam Paragon mall, which is popular with both locals and tourists. The bombs weren’t intended to kill and were instead designed to cause disruption, police spokesman Prawut Thavornsiri said.

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