A paramedic feared she was being sprayed with acid when she was flagged down by three attackers while answering a 999 call.

The 32-year-old woman had a "noxious substance" thrown at her as she responded to an emergency call about a patient suffering from chest pain.

London Ambulance Service (LAS) said the trio appeared to be in distress in Tottenham Hale, north London, when they flagged her down at about 1.30am on Sunday.

But as the lone female paramedic, who did not want to be named, stopped to ask the men if they were OK, they pulled up bandanas to cover their faces.