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A man has been left with serious facial injuries following an 'acid' attack.
Officers were called to Keyes Road, Dartford, after two men riding a motorbike targeted a man in his car at around 3.40pm on Sunday.
The substance has been tested and results are pending.
A 23-year-old man was with a 16-year-old relative outside Tesco after drawing out some money from the cash machine.
He then drove off from the car park and stopped his Ford Fiesta in Keyes Road, 30 minutes before the attack.
Half-an-hour later two men on a moped approached, opening the driver's door and sprayed the driver and passenger with a substance.
As the victim drove away, a third man in his 30s, who was driving past, stopped in the road and got out of his Jaguar.
"The victim has sustained serious injuries which potentially could be life changing..." - Detective Inspector Chris Dovey
The suspects then sprayed the liquid substance in his direction, with some of it landing on him.
The two victims in the Fiesta managed to travel to a nearby address where the emergency services were called.
All three were taken to hospital, with two of them being discharged. The driver of the Fiesta remains in hospital for further treatment
Police are looking for two young males, who were wearing dark clothing, motorcycle helmets with tinted visors and leather gloves.
They were using a black moped without a number plate.
Detective Inspector Chris Dovey, who is overseeing the investigation, said: "We would like to ask motorists who were in the area at around the time of the incident to view their dashcam footage to see if they have captured two men riding a black moped without a number plate. Any footage they may have, regardless of the quality, could be important to the investigation.
"The victim has sustained serious injuries which potentially could be life changing and we are conducting a number of enquiries to find out who is responsible for this serious assault.
"We are currently following a number of lines of enquiry and are reviewing CCTV footage.
"We do not underestimate the impact that assaults of this nature has on a community and as a result extra officers will be patrolling the Temple Hill area over the coming weeks.
"If anyone has any information that may help us with our investigation, I would ask they get in contact with us."
Dartford MP Gareth Johnson labelled the assault as 'cowardly and evil'.
Inquiries are ongoing and anyone with information is asked to call 101, quoting reference 03-1016.