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Police today searched a house in Manchester, which was home to a British man who was killed in Syria.
Abu Layth - his family name is understood to be Anil Khalil Raoufi - had travelled to the war-torn joined the fight against President Assad.
ITV News International Correspondent Rageh Omaar reports on the growing number of young British men choosing to take part in the conflict:
The mother of a British man who is reported to have been killed in Syria has been described as "very much involved in the local community."
A neighbour in the Manchester suburb Didsbury said Anil Raoufi's father was rarely seen as he would sleep during the day and work at night but the mother was very visible.
"Kamala is a gorgeous lady, really friendly, tries to integrate in everything." Another neighbour said: "Kamala is a lovely, lovely woman, completely part of the street's life, not at all isolated, since the day they arrived."I'm really shocked."
Anil Raoufi is understood to have enrolled at university and attended a local mosque before going to Syria.
Neighbours of the family of a British man who is believed to have been killed in Syria spoke of their shock today as police carried on searches at the family's detached home on a quiet, tree-lined street in the affluent Manchester suburb of Didsbury.
But one woman, who did not want to be named, said Abu Layth, whose family name is understood to be Anil Khalil Raoufi, appeared to change from being a "normal" teenager as he grew older.
He had been very friendly and enjoyed football with another youngster on the street but then changed his appearance and habits around three years ago.
"When you spoke to Anil on the street he would not say hello like the others did," she said."He started wearing the robes as well. I was quite frightened of him a little bit. He was not the same."
The father runs two restaurants on Manchester's "Curry Mile" and the mother, Kamala, is a housewife. They are believed to have come to the UK from Afghanistan around 10 years ago and would make usually annual trips back there.
Police investigating the reported death of a British man in Syria said they are carrying out a search of a house in Manchester today.
"As part of this inquiry, officers are also providing support to the family and are speaking to them to understand how a man from the North West came to be reportedly killed in Syria," Detective Chief Inspector Will Chatterton of the north west counter-terrorism unit said.
"As part of the National Prevent Strategy, officers are working to assess how people are drawn into travelling to Syria to become involved in conflict and how to prevent others doing the same.
"We know that some have already lost their lives or been detained by the regime and badly treated.
"It is vital that anyone who has concerns that someone may be considering such travel informs the authorities," said Inspector Chatterton.