Police are appealing for witnesses after a suspected acid attack on a couple in Daventry.
A noxious substance was squirted at the victims from a moped as they stood at a zebra crossing in Park Leys in the early hours of Saturday morning.
The man suffered burns to his forehead and the woman to her legs. They were later treated for minor burn injuries at the scene by paramedics before being transferred to Northampton General Hospital.
The rider of the moped is described as wearing grey joggers, trainers, a cream-coloured hoodie and a white helmet.
The passenger was white and had dark hair. He was wearing dark clothing.
The substance used is now under analysis to determine what it was.
Detective Chief Inspector Louise Hemingway, of Northamptonshire Police, said: “This was an extremely harrowing incident for the two victims who were making their way home after a night out.
“We would urge people to be extremely vigilant to this type of incident which, as evidence suggests, is becoming increasingly common in this country.”