Kolkata: As many as 22 passengers were injured some of them critically when a bus they were travelling in overturned on Berhapore-Hariharpara Road on Wednesday morning.All the injured persons were taken to Murshidabad Medical College and Hospital by the local people immediately after the incident. The local people took part in the rescue operation before the police reached the spot. Police said that a private bus on its way to Berhampore with 35 passengers overturned near Katabagan area under Berhampore police station at around 10 am. The local people heard a loud thud and rushed to the spot. They brought the injured persons out of the bus many of whom were in traumatised condition. Some of the victims had received serious head injuries. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseThe eyewitnesses told the police that the driver was over-speeding the vehicle. The bus driver applied sudden brake when it overturned. The exact cause of the accident is yet to be confirmed by the police. The incident caused traffic congestion in the area for sometime. The police later removed the vehicle from the place and the traffic movement was restored. The police are investigating if the bus developed any technical snag resulting in the accident. The bus driver reportedly injured in the accident. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataAccording to the police, around seven passengers are stated to be in critical condition. According to the preliminary investigation police suspect that the bus driver might have applied the emergency brake as biker might have come on its way. The bus was also seriously damaged in the accident. Police also suspect that bus was running at an average speed between 50-60 when the accident occurred. Police have started a detailed probe in this connection.