Witnesses reported that an explosive device was hurled from the Sathorn bridge near a parking lot for pickup truck taxis, at about 1:20pm.
The device bounced into the water and exploded there.
There were no immediate reports of injuries or damage.
Police closed Sathorn Rd to traffic from the pier to the Saphan Taksin BTS station.
Sathorn pier is a terminal for Chao Phraya commuter boats and a sort distance from the Skytrain station. It’s also a popular stop for Chinese tour groups.
The explosion sent water into the air over 10 metres high, reported Thai PBS.
Witnesses near the bridge said hundreds of small pellets were strewn into all directions from the explosion which they said was a pipe bomb.
They said the bomb was very powerful because they saw water being sent into the air very high.
EOD police are at the scene and seal off the area to find evidence.
It was not known if this second explosion had any link with the explosion at Ratchaprasong that killed at least 20 people last night (see story here), but the explosion sent out hundreds of pellets similar to this explosion.
Read the original Bangkok Post report here.
Read the original Thai PBS report here.