A man is fighting for his life in hospital tonight after an acid attack at his home in Truro.
The 29-year-old had the chemical thrown in his face after answering the door.
Detectives are treating the attack as an attempted murder and are keen to trace a red Peugeot van they think was used by the offender.
Detective Inspector Sharon Donald is from Devon & Cornwall Police:
A man is being treated for life threatening injuries after he had acid thrown in his face in Truro.
He was attacked in his home on Carrine Road yesterday afternoon.
Police say he's now in a critical condition at the Royal Cornwall Hospital.
Detectives want to talk to the driver of red Peugeot van seen in the area around the time of the incident.
David Burchell, 83, said: "I was very surprised when I heard something like this had happened on our street.
"It's usually very quiet around here. We're still not entirely sure what happened, but as far as we are aware someone through a chemical in someone's face, just down the road."
A man is in a critical condition in hospital in Cornwall after acid was thrown in his face.
It happened in Carrine Road in Truro on Tuesday afternoon.
The 29-year-old victim was attacked in his own home by an unknown man.
The man was taken to Treliske Hospital, Truro, with life-threatening facial injuries, where he remains in a critical condition.
Police are keen to speak to the driver of a red Peugeot van seen in Carrine Road around the time of the incident.
Detective Inspector Sharon Donald, from Truro CID, said: “We are keen to speak to anyone who saw any unusual people or vehicles in the area yesterday, in particular a red van.
“If you are the driver of the red Peugeot van seen in the area, please get in touch with police so we can eliminate you from our enquiries.”
Officers have been carrying out house-to-house enquiries, handing out leaflets, and patrolling the area to reassure residents.
Anyone with information is asked to contact police.
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An estimated 30,000 people turned out to watch Truro's City of Lights Festival last night - making it one of the busiest ever.
The parade featured giant lanterns with a 'heroes' theme, with some paying tribute to the First World War centenary. The paper and withy creations are made by local school children and a team of artists.
Thousands of people turned out in Truro last night for the annual City of Lights festival.
The parade featured giant lanterns with a 'heroes' theme, with some paying tribute to the First World War centenary.
The paper and withy creations are made by local school children and a team of artists.
The City of Lights incorporates art, music, dance and, as its name suggests, light.
The event features is a procession of giant handmade withy and tissue lanterns floating through the streets carried by professional artists accompanied by a host of smaller lanterns carried by Cornish school children and local community and youth groups.
Thousands of people will be in Truro tonight for this year's City of Lights parade, which is themed 'Heroes', inspired by the First World War.
People from across the county come to see the procession of giant lanterns handmade by hundreds of local schoolchildren.
The event also marks the beginning of the city's festive celebrations.
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Plans for two supermarkets and 1,200 homes to the west of Truro go before Cornwall Council later.
But supporters of a new stadium for Cornwall say that, if they're approved, it could jeopardise plans for another supermarket which is needed to finance the project.