A third man has been charged with attempted murder after "gunshots" were heard in Stevenage.

Tommy Harber, 25, of Barley Mow Lane, in St Albans, has been charged with attempted murder and possession of a firearm with intent to endanger life.

He was remanded into custody and will appear at Hatfield Remand Court tomorrow (Saturday, September 16).

On Monday, Tom Harber, 50, of Holwell Lane, Essendon, was charged with attempted murder, possession of a firearms with intent to cause fear and violence, dangerous driving and failing to stop at the scene of a collision, in relation to the same incident.

That was followed on Wednesday by Terry Holmes, 31, of Dyes Lane, Stevenage, being charged with attempted murder, possession of a firearm with intent to endanger life and dangerous driving.

At around 6.15pm on Wednesday, September 6, two vehicles are understood to have been driving erratically along the A414, heading from Essendon towards the A1(M).

The vehicles – a green Mercedes and a white flatbed van – then entered onto the motorway at Junction 6 for Welwyn, driving northbound towards Stevenage.

At around 6.30pm, both vehicles left the motorway at Junction 7 for Stevenage, and the Mercedes was then involved in a collision with a private ambulance on the roundabout above the A1(M). Nobody was injured in the collision.

Both the Mercedes and the van then travelled into Stevenage, along Lytton Way, and past the police station, where gunshots were reportedly heard.

Lytton Way was subsequently closed to allow a full investigation to be carried out.

One man was taken to hospital with serious, but not life-threatening injuries, believed to have been sustained prior to the incident.

"Three people have now been charged and we hope this news reassures the public. Those involved are believed to be known to each other and again, I hope that is of some reassurance," said Detective Inspector Iain Macpherson, from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit.

"We’ve been carrying out extensive enquiries and as part of our investigation, we are keen to trace the green Mercedes which has registration ending in WUG. Please do not approach if you do see this vehicle but call 999 immediately."

You can report information online at herts.police.uk/report, via online web chat at herts.police.uk/contact, or by calling the non-emergency number 101, quoting reference 41/71924/23.

Alternatively, contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.