BANGKOK — A blast blew out the side of a residential building in a Bangkok suburb yesterday, killing three people in what police said might have been a bombing.
Police had yet to establish the cause of the blast, and there was no obvious reason that the five-story apartment block in Nonthaburi Province, near the Thai capital, might be a target.
The TNN cable news channel reported that police explosives specialists were speculating that the blast was caused by TNT or C4, perhaps used in a bomb as big as 110 pounds.
Nine people were injured.
Dozens of bombings have plagued Bangkok this year, during antigovernment protests from March to May and in the months since the military cleared the streets, but none of such magnitude. Small blasts since July have killed one person and wounded a dozen.
There have been no claims of responsibility for any of the attacks.
TNN said police explosives specialists believed yesterday’s blast may have been similar to bombs Islamic separatist insurgents used in southern Thailand.
The insurgents have been waging a terror campaign since 2004 that has led to about 4,300 deaths.
The blast occurred on the same day that Thai authorities extended a state of emergency in Bangkok and three surrounding provinces, citing continued security concerns.