The prime accused in the case, Manish (32), son of an official at a premier investigation agency, was arrested last night. His interrogation led police to the other accused, Robin (26), arrested today, a senior police official said.
Teams have been formed to track down the other two accused, of which one is suspected to be a minor, he said.
Police have recovered the Maruti Swift car in which the group had fled after the incident took place on Monday night but they are yet to recover the gun with which the eatery owner Vasudeo was shot dead. To evade arrest, the group had also allegedly replaced the car's registration number plate with a forged one.
During interrogation, it came to light that the group had a heated argument with the restaurant staff over discount related to their dinner bill which went up to Rs 1,085. During the argument, one of the staff members slapped Sagar (absconding) in the presence of several other customers in the eatery, the senior official said.
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Sagar felt insulted and convinced his friends to go back to the restaurant for revenge. They then went to Robin's house, where Manish had kept his gun, and returned over an hour later. It was Manish who allegedly pumped two bullets into Vasudeo's body.
After the incident, the group not only dodged the eatery staff who chased them towards Ring Road, but also a police team which was deployed at a picket nearby, the official said.
The accused were tracked with the help of the registration number of the car, which turned out to be the property of a Greater Noida resident.
When he was questioned, it emerged that he had recently sold the vehicle off to a group, which later turned out to be Manish's and his friends, but the documentation was yet to be done.