Another explosion hits Bangkok
"No one was killed or injured. Police are at the scene to investigate what kind of device it was," an officer at Yanawa police station, who asked not to be named said.
He says the incident took place shortly after 1pm near the Saphan Taksin BTS skytrain station.
CCTV footage of the incident posted by Thairath TV showed commuters scurrying for cover over a footbridge after the device exploded in the canal, sending a large plume of water into the air.
The Yanawa police official said officers believed the device was thrown from a road and rail bridge which spans Bangkok's Chao Phraya river and overlooks the canal below.
The luxury Shangri-La hotel, the Mandarin Oriental and the French embassy are close to Saphan Taksin station.
No one claimed responsibility for the incident.
Bangkok is a city on edge after Monday night's bomb attack, described by junta chief Prayut Chan-O-Cha as the "worst ever attack" on Thailand.
At least eight foreigners are known to have died in the attack alongside five confirmed Thai deaths. The rest have yet to be identified.
More than 100 other people were injured as the blast left body parts strewn across the pavement, alongside shattered windows and mangled motorcycles.
An explosion was heard near a pier at Sathorn Bridge. No injuries were reported. Authorities at the scene now.
— Bangkok Post (@BangkokPostNews) August 18, 2015
A grenade was thrown from Taksin Bridge but it missed the Sathorn pier target, witnesses said, adding it went off in the Chao Phraya River.
— Bangkok Post (@BangkokPostNews) August 18, 2015
(File photo: AFP)