Calcutta police said on Thursday there was second person in the Jaguar that crashed into a Mercedes and led to the death of two Bangladeshi bystanders on Theatre Road-Loudon street crossing last week.

He is a young man who was seated next to Raghib Parwez and still bears marks from an airbag slap that a person suffers when an airbag is deployed during a crash.

The Telegraph knows the identity of the man whom Parwez had met just a few hours ago in a friend’s birthday bash but is withholding it because he is likely to be a key witness in the case.

Police said he had narrated the sequence of events that night “frame by frame” when officers at Lalbazar quizzed him about what happened.

“Raghib and this man met at the party of a friend. Since both of them live near Park Circus, Raghib offered to drop him. But while returning, Raghib got a call from a friend in Kyd Street and they took a detour. At this, the youth said he would get late. Raghib then agreed to drop him first and then go to his friend. But they met with the accident before that,” said joint commissioner (crime) Murlidhar Sharma.

The friend, in his early 20s, has done his MBA abroad and runs his own business, the police said.

“He would be a witness in the case. He remembers the incident frame by frame,” Sharma said.

Sources said CCTV footages have shown two youths coming out of the Jaguar, walking and then running along Theatre Road and Rawdon Street before a member of Raghib’s family picked them up from in front of a sari showroom near the Mullickbazar-Park Street crossing.

From other witnesses in the party where Raghib was present before he took the wheel, the police would try to ascertain if he was intoxicated or fit to drive.

Raghib, who had fled to Dubai after the accident, was arrested four days after the arrest of his younger brother Arsalan Parwez, who had initially owned up to what now appears to be his elder brother’s offence.

In the absence of any tests or medical reports that could suggest presence of alcohol in the blood, the police have not levelled charges of drink driving.

Raghib has been charged with culpable homicide not amounting to murder (section II of IPC) that deals with the knowledge of the consequences of an act, attempt to culpable homicide not amounting to murder, rash and negligent driving and mischief. The charges if proved before the court would lead to a maximum punishment of 10 years of imprisonment.

“Charges could be amended if there is circumstantial evidence or more witnesses. But in this case, there is no scope of any medical proof,” said a cop.

Raghib will be in police custody till September 3. Arsalan and his maternal uncle Mohammed Hamza, who is accused of enabling Raghib to flee to Dubai, were released on bail.

The police said they would move court requesting that the witness’s statement be recorded before the magistrate under Section 164 of the CrPC.