Two homemade bombs exploded in front of the Siam Paragon shopping mall on Sunday night, police said. Nobody was injured.
The BTS suspended services at the Siam Station at 8.10pm after the two bombs exploded under the sky path linking the mall and the Siam BTS station.
The service resumed at 8.38pm.
Police said the bombs were planted behind a power transformer.
Bomb disposal officers and crime detection officers from both the Pathumwan police station and the Metropolitan Police Division 6 rushed to the scene after the explosions took place and sealed off the area to gather evidence.
Police said the bombs were made of steel pipes.