The businessman after being found alive in Comilla on Monday, six days after he had gone missing, said he was kidnapped from Chittagong by a group of armed men in a black microbus.
Mridul, before his abduction, had filed a case against RAB Major Rakibul Amin, a RAB source and his own driver for looting 80 Bhori (933g) of gold.
He had filed a general diary after his brother had gone missing which later became a case of kidnap.
“It’s important to know if Mridul staged his own abduction,” RAB Additional Director General Col Ziaul Ahsan told bdnews24.com.
He thought it was strange that Mridul was getting his driver to transfer 80 Bhori of gold to Old Dhaka.
Meanwhile, the CID are in charge of investigating the case Mridul had filed before his abduction.
“RAB is also investigating the officer in question,” said Col Zia. “We will deal with him sternly if the probe finds him guilty.”
Jewelry traders in Chittagong had threatened to shut businesses across the country if Mridul was not found.
Mridul owns the Dulhan Jwellers at Chittagong’s New Market.