The accused, who robbed the employees of Brinks Arya Company on Thursday night, had been keeping a watch on them.
This is what the Shivaji Park police who are investigating the robbery suspect.
The robbers intercepted the employees and looted the bag containing Rs 6.8 lakh and escaped in a car. They abandoned their car after travelling for a few metres.
The police also suspect that an insider might have alerted the robbers.
According to the police officers investigating the case, they have seized the car that was found abandoned by the robbers.
The police found out that the car in which the accused escaped was stolen.
The car belongs to Sundar Gavankar, a resident of Powai, from whom the car was stolen few days ago from his residence. Gavankar had lodged complaint about the theft at Powai police station.
Suresh Unawane, senior police inspector of the Shivaji Park police station, said: "We were confused when we found the abandoned car a few minutes after the robbery." Inquiries revealed that the four had stolen the car from somewhere in Powai a few days before the robbery and a police complaint has been registered at the police station.
"Tracing the robbers of the car could also lead us to the four accused," said Unawane adding that the police team is in the process of preparing sketches of the four accused from the inputs by the complainants.
"We suspect that the four might have made their getaway by train after abandoning the car near the railway station. We are trying to map the escape routes that the robbers might have used for their getaway and further inquiries are on," Unawane said.