A former member of the Pakistani government was injured in an acid attack in Royston, and police are re-appealing for information and witnesses.
The incident took place at around 4.35pm on Sunday, November 26.
Two men knocked on the door of Shahzad Akbar, ex-adviser to former Pakistani Prime Minister Imran Khan, and threw an acidic solution at him.
Mr Akbar was taken to Addenbrooke's Hospital in Cambridge and later discharged with acid burns to his arm.
Police are now re-appealing for information and dash cam footage, and are particularly keen to trace a motorbike that was believed to be used by the offenders.
Detective Inspector Ben Smith, from the North Herts Local Crime Unit, said: "Our enquiries into this investigation are ongoing.
"I’d like to reassure our communities that we believe this to be an isolated incident.
“As part of our investigation, we understand that the suspects entered and left Royston via Old North Road.
"They were believed to be riding an orange motocross style motorbike.
"We are continuing to establish the route the motorbike took before and after the incident. I encourage anyone with dashcams to review your footage as you may have captured something that could help us progress the investigation.
"This type of motorbike is typically a loud vehicle, which may have activated some doorbell cameras.
"Therefore, I encourage our residents to please check any doorbell footage as you may have captured the vehicle in the area.
"The two suspects are described as wearing motorcycle helmets, one was wearing a black jacket and the second wearing a red jacket.
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"If you have any information or may have witnessed the vehicle travelling close to Old North Road on the day, please contact me directly via Ben.Smith@herts.police.uk."
You can also report information online at herts.police.uk/report, speak to an operator in the Force Communications Room via the online web chat at herts.police.uk/contact or call police on the non-emergency number 101, quoting crime reference 41/94730/23.
Alternatively, you can stay 100 per cent anonymous by contacting the independent charity Crimestoppers on 0800 555 111 or via their untraceable online form at crimestoppers-uk.org.
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