The ghastly mishap occurred at the Kanadiya bypass when the speeding school bus rammed into a truck on Friday, killing four students and the bus driver, Rahul Sisodia.
A faulty speed governor device installed on the bus is suspected to be the cause behind the accident.
"Police yesterday arrested Delhi Public School (DPS) Transport Officer Chaitanya Kumawat, Suvidha Auto Gas director Neeraj Agnihotri and its staffer Jalaj Meshram," Additional Superintendent of Police, Manoj Kumar Rai told PTI today.
The incident had occurred when Sisodia lost control of the bus, which broke the divider and entered a parallel lane, before colliding head-on with the truck.
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As per preliminary investigation, though Suvidha Auto was not authorised to install the speed governor in the school bus, it did so illegally.
Rai said Suvidha Auto prima facie procured a fitness certificate from Transport department on forged documents.
He said the school bus was running at the speed of more than 60 km per hour when it crashed into the truck.
As per a Transport department rule, speed governors should restrict the speed of school buses at 40 km per hour, the officer said.
He said more charges were likely to be slapped against the accused trio during the course of investigation.
DPS Indore principal Sudarshan Sonar had claimed that the ill-fated bus was fully fit to run on the roads.
The 34-seater bus was issued a fitness certificate on December 26, 2017 (10 days before the accident) and it was valid till December 25, 2018.
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