A crude explosion ripped across the busy Serai Lane in Mehrauli, killing a nine-year-old boy and injuring nearly 20 on Saturday afternoon.
Till late on Saturday, no group had claimed responsibility. Five men were detained at the Delhi airport on Saturday evening and the police are probing their role.
The two motorcyclists involved in Saturday’s blasts were wearing black shirts, dark grey trousers and were in their late twenties, police said. They were riding a black Pulsar.
The men might have conducted thorough recces more than once, said a police officer. Police said they found traces of ammonium nitrate, acid and iron nails packed together in a cardboard box resembling a tiffin box.
“The pear-shaped box was wrapped in a polythene bag and newspaper. There was no timer or detonators attached to the explosives, suggesting a crude bomb,” said a police officer.
This year, five such similar explosions have occurred in south Delhi. Police, however, did not confirm whether the same group was involved in Saturday’s incident. “The explosives used and the make of the bomb is different from those used in the September 13 serial blasts,” said an officer.
Police were also probing the role of the two Bangladeshis, Yessin Muhammad and Muhammed Majruddin, who were arrested from Jalpaiguri district in West Bengal in July this year.
Police recovered five crude bombs, a country-made revolver and some ammunition from their possession and were probing their role in explosions in south Delhi’s Lado Sarai and Mehrauli areas since January this year.
“It is too early to say the group involved behind the blasts. At this point, it is difficult to say whether these explosions are similar to the ones that took place in south Delhi,” said the officer.
Police said in earlier explosions the crude bombs packed in a tobacco can were planted mainly at busy road intersection. This time it was a busy market lane.
Till late on Saturday night, police had picked up several Bangladeshis for interrogation.