Four people, including a kid, were killed in accidents in the city on Friday.

A motorcyclist died and his pillion passenger was injured when a heavy goods vehicle hit the bike on Julpia Road in Haridevpur around 4.30am.

Sanjib Naru, 22, of Sonarpur was declared dead at MR Bangur Hospital. Avijit Mondal, the pillion passenger, was discharged after first aid.

Around 7.45am, Akash Biswas, 4, was headed for school on his mother's bicycle at Nayabad in Mukundapur off the Bypass when a truck grazed it and he flew in the air and landed in front of the vehicle, police said.

Witnesses said the kid was crushed under the rear wheels of the truck that was coming from the opposite direction as his mother fell by the roadside.

The kid was metres away from his school, Universal Academy, about 2km from the Rabindranath Tagore International Institute of Cardiac Sciences, when the accident occurred.

An officer of Panchasayar police station said the truck was headed towards Panchpota near Garia station to dump construction debris. Investigations are on to find out if the trucker, Megaha Sau, lost control, he said.

"It is also possible that the kid's mother, Tulsi Biswas, 30, who learnt cycling recently lost control and crashed against the truck," the officer said.

Biswas, however, claimed Sau was drunk, which is why he lost control and hit her.

Moments after the accident, people of the area pounced on Sau and began thrashing him, another officer said. They refused to let cops extricate the child's body from under the truck, he said.

Reinforcements from Lalbazar brought the situation under control, an officer of the East Jadavpur traffic guard said.

Sau, booked for rash and negligent driving, is being treated at MR Bangur Hospital for multiple injuries, the police said.

The next accident took place around 8am on the Baghajatin flyover on the Bypass.

A West Bengal Surface Transport Corporation bus, running on lease on the Garia-Belur Math route, crashed into the railings of the bridge after its axle broke and overturned, the police said.

Bapi Khatua, 40, the conductor, was possibly crushed when the bus toppled over the bridge and fell on its side, the police said.

He was declared dead at Peerless Hospital.

Of the eight injured passengers, two have been kept under observation, Sudipta Mitra, the hospital CEO, said. The others were discharged after first aid, he said.

Cops said the axle broke because of poor maintenance. "The bus was coming from Garia station. The accident occurred just after the bus descended from the flyover," an officer of Survey Park police station said.

"As the axle broke, the driver lost control and rammed into the concrete railings and overturned," he said.

People of the area and passers-by broke open the emergency window and brought everyone out, another officer said. But the driver managed to flee the spot, he said.

Around 6.30pm, a biker skidded on a patch of sand near Nazrul Tirtha in New Town's Action Area I.

Tapan Mondal, 24, of New Town was declared dead at Bidhannagar Sub-divisional Hospital. The police said he wasn't wearing a helmet.