Police have ruled out any terror angle in the blast which took place in the shop located in Subjimandi area in the district.
"Excess of electric supply from the transformer to the monitor is likely to be the reason for the blast," said Sanjay Sharma, Gumanpura Police Station Circle In Charge.
However, officials from the electricity department were yet to visit the scene to acertain if the blast was due to excess power supply from the transformer, he said.
Pankaj (12) was severely injured and was undergoing treatment at Maharao Bheem Singh (MBS) Hospital.
Mohan Lal was downloading the items for Puneet and Pankaj when the blast took place in the computer monitor, the police officer said.
According to eye-witnesses, the distributor point of the shop's transformer blasted first leading to the blast in the monitor.