A bomb hidden near rubbish bins in a busy suburban Bangkok shopping area left seven people wounded, Thai police said on Monday.
The homemade device exploded at about 9pm on Sunday in Ramkhamhaeng, a university area of the Thai capital, said Police colonel Narongrit Promsawan.
“Police are investigating to see what caused the explosion and who were involved. A preliminary investigation of the scene found many nails were part of the device,” he said.
Narongrit said police did not think the bombing was part of a broader campaign.
He said none of those hurt was in a serious condition.
Deputy government spokeswoman Sunisa Lertpakawat said security forces were urgently probing who was behind the blast.
“It is now under investigation, which may take time, but not too long because security for Thais and foreigners is a very important matter for this government,” she said.