Investigators probing the 26 May bomb blast in Haryana's Pipli have warned that the blast may have been a trial run for a larger attack.
Indian Express reported that investigators believe that Delhi could also be a potential target.
The 26 May blast that ripped through a Haryana Roadways bus in Kurukshetra district left eight people injured. According to an Indian Express report, the bomb was enveloped in a yellow polythene bag with some lines in Thai written on it.
The probe into the blast has revealed that that bomb had no shrapnel and was made up of firecracker material. The ingredients used to prepare the bomb are easily available in the market and it appears that whosoever assembled the bomb was trained to do so, the daily reported.
It is important to note that two other explosions have rocked Haryana this year - in empty trains in Panipat. It is believed that all the three blast are similar in nature, which adds to the trial run theory.
"Not packing bombs with shrapnel means that the bomb-maker did not want to cause fatalities. If he could get explosives, circuit, timers and assemble them, there is no reason why he would not pack them with shrapnel. Either the bomb-maker just wants to send a message or these are trial runs for a bigger attack in the near future," The Indian Express quoted an anonymous central security establishment officer as saying.
"The 12 Volt battery, which is similar in the three blasts, is also being examined for its lot number. The explosives seem to have been obtained from firecrackers. Hopefully these will lead the probe team to the people behind the blasts," the officer told the daily.