Police reconstructed the sequence of events and marked out three separate zones -- the area where the bus was replaced, the Devli turn and the place where the vehicle was accosted for carrying out minute search -- for clues.
A special team, led by Inspector Kuldeep Singh, SHO Neb Sarai, was constituted to crack the case.
While scouting the area, the team got inputs about an unattended auto-rickshaw, few metres away from where the bus passengers were robbed.
Also police was informed by one Raj Kumar that his auto had been missing.
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Upon being confronted, Kumar broke down and confessed to his involvement. Other accused were also arrested yesterday based on his inputs, police said.
Kumar, during interrogation, said he had received information about the 'baraat' bus returning late night from the Swaroop Nagar area and he and his associates hatched a conspiracy the auto-rickshaw was used for stopping the bus.
Members of the wedding party were allegedly robbed in the early hours yesterday in south Delhi's Devli area.
They attacked the bus driver and snatched jewellery and cash worth lakhs of rupees from the bus occupants at a gunpoint.
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