A passenger suffered cuts to her face after a glass bottle was thrown at the bus she was travelling on in Norwich, smashing a window.

The incident happened at about 8.15pm last Friday as the number 22 First bus travelled along Bussey Road in Catton Grove.

A suspect or suspects threw a bottle at the side of the bus, shattering a window and injuring a 21-year-old woman who suffered cuts above her left eye.

It comes as police investigate similar incidents in the area over the weekend where objects were thrown at vehicles, prompting an increase in patrols.

On Saturday a large stone was thrown at a Toyota Avensis travelling on Mile Cross Lane towards Sprowston. It happened close to the junction of Harmer Road on the edge of the Fiddlewood estate and the stone shattered the front passenger window causing the driver, who was in the car with his wife and baby, to swerve. Police said nobody was thought to be injured.

A third incident happened on Sunday at about 5.45pm as a double decker bus travelled on Mile Cross Lane in Catton Grove, near to the speed camera, when an object was thrown at the vehicle causing a nearside window to smash. Police said nobody was believed to have been injured.

Local policing commander Inspector Nik Hewitt, said: 'Throwing objects at vehicles puts the driver, passengers and other road users in danger.

'It's fortunate the bus passenger didn't suffer more serious injuries while the incident involving the Toyota could have had very serious consequences.

'This reckless behaviour will not be tolerated and anyone found committing such an offence can expect robust action from police and I would urge anyone with information about those involved to come forward.'

Three teenage boys, aged between 13 and 15, have been arrested in connection with the incidents on Friday and Saturday and have been released on bail while enquiries continue.

• Officers would like to hear from anyone who may have witnessed the incidents or noticed people acting suspiciously in the areas stated. Contact the Norwich North Safer Neighbourhood Team on 101 or call Crimestoppers anonymously on 0800 555 111.