The investigation is ongoing; authorities are seeking information to complete inquiries and have informed the victims’ families and offered condolences.

Police are appealing for witnesses who were traveling toward Boston or Swineshead between about 17:15 and 17:50 to come forward.

The road and A1121 remain closed as investigators conduct a forensic collision inquiry and search the scene.

A 19-year-old man has been arrested on suspicion of causing death by dangerous driving and remains in custody.

Investigators are reviewing evidence from the crash site as part of the ongoing inquiry.

Families of the victims have been informed and are being supported by specially trained officers.

The road remains closed on Sunday as the investigation continues.

The crash involved three vehicles — a green Vauxhall Corsa, a blue BMW 1 Series toward Boston, and a black BMW 1 Series toward Swineshead — and occurred shortly before 18:00 GMT.

Detective Sergeant Kate Johnston of the Serious Collision Investigation Unit is leading the inquiry and is asking for witnesses, dashcam footage, or any information, with contact details provided.

Two people, an 18-year-old woman and a 25-year-old man, died in the three-car collision on the A1121 near Sutterton Drove, close to Boston, on the evening of December 6.