Chiang Mai - A small bomb on Wednesday night exploded at the telecommunication office in Mudon of Southern Burma's Mon state, sources said.
The bomb exploded under the stairs of the Telecommunication located in the Kyaik Paik village, about 2 miles away from Mudon town, but caused no casualties.
"The bomb exploded at about 11:30 p.m in the night and following the blast authorities found four TNT explosives. The buildings were not so much damaged," a local resident of Mudon told Mizzima.
While no groups have so far claim responsibility of the blast, authorities said they are investigating.
The blast is the third explosion in Burma within a month's time.
Earlier on July 14, a small bomb exploded near Deik Oo town in Pegu division on an Express Bus that is running on the Rangoon-Pegu highway, and killed a passenger.
On first of July, a similar bomb explosion took place at the local office of the Union Solidarity and Development Association (USDA), a pro-junta civil association, in a suburban township of Shwe Pyi Thar in Rangoon.
While the blast caused damages to the furniture and parts of the building, there were no reports of human casualties.
While there have been no groups claiming responsibility for the two blasts in Deik Oo and Mudon, an armed underground group known as Vigorous Burmese Student Warriors (VBWS) claimed responsibility for the bomb blast at the USDA office.
The VBWS, who claimed to be a student armed groups operating in Burma's commercial hub Rangoon, in their statement said the blast was a warning for members of the USDA, who were active in carrying out the military ruler's command including harassing and arresting peaceful protestors in September last year.