Lake Gardens: The 21-year-old student who died after the motorcycle he was riding rammed into a pavement on the approach to the Lake Gardens flyover early on Sunday had fractured his skull and suffered brain haemorrhage, police said.

Souryadeep Singha, a first-year student at the Indian Institute of Hotel Management, was riding the bike without a helmet. So was pillion-rider Monojit Nandan, who suffered critical head injuries.

"The doctor who conducted the post-mortem told us that Souryadeep had died of internal haemorrhage. He was taken to MR Bangur Hospital, where he was declared dead on arrival," an officer at Charu Market police station said.

Doctors at MR Bangur Hospital referred Monojit to NRS Medical College and Hospital. His family shifted him from the Sealdah hospital to Samaritan Nursing Home on Elgin Road on Sunday afternoon.

"We could not question him on Monday as he was not yet in a position to respond to queries," the officer said.

A CT scan has revealed small clots in his brain but he did not suffer any fracture.

"His level of consciousness was better than yesterday. But he is not in a position to recount the sequence of events or face questions. He could only tell which part of his body was aching," a doctor at the nursing home said.

A neurologist who examined Monojit on Monday said the clots in his brain could be treated with medicines.

According to the police, Singha and Nandan were part of a group of eight who were racing on four motorbikes.

The 400cc Bajaj Dominar that Souryadeep and Monojit were riding crashed into the pavement on Deodhar Rahman Road, 50m from the Lake Gardens flyover, around 6.10am. The bike mounted the sidewalk following the collision and hit the circular concrete platform at the base of a tree.

Officers of the "fatal squad" of the traffic police department who examined the motorcycle said the two-wheeler was moving at 80-100 kmph when it rammed into the pavement.

"The vehicle will soon be subjected to a mechanical test," an officer of the squad said.

The registration numbers of the other three bikes are not properly visible on the CCTV footage. "We are collecting footage of CCTV cameras installed at nearby crossings in an attempt to identify the bikes," another officer said.