One bomb detonated on a sidewalk in an alley in Rama IX area, injuring two. The injured were rushed to a hospital, reported Xinhua.
Along with that two more explosives exploded outside the Government Complex in Chaeng Wattana area on Bangkok's northern outskirts.
Another explosive went off near a BTS elevated railway's Chong Nonsi station in Sathorn area.
An investigation is underway.
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