A BUS has toppled over in Spain with shock pictures showing the vehicle flipped at the entrance of a tunnel.

Two people were badly injured in the smash and the driver remained trapped, according to early reports.

The bus was seen spectacularly flipped over at the mouth of a tunnel

Emergency services rushed to the scene with 15 injured

Helicopter footage showed the wreckage from above

The bus flipped over at about 8:45am after a collision at the mouth of the tunnel.

Fire trucks, ambulances and medical helicopters rushed to the scene.

All passengers were pulled out from the wreckage but the driver remained trapped inside, according to TV network RTVE.

As many as 15 were injured with two people in a serious condition.

The horror smash occurred on the C-32 highway in Barcelona between Pineda de Mar and Tordera.

The C-32 is now closed northbound.

Catalonia authorities have sent out a ‘PROCICTAT’ alert, only issued for special emergencies.

The bus was taking workers from Barcelona to Tordera.

Traffic patrols were called to the scene to work with emergency services, police said.

Pictures show the bus remaining upright, with a group of firefighters climbing up to the top of the tunnel to reach the front of the vehicle.