Shocked sister of IS suspect : I will kill him myself
The key suspect in the hunt for the new "Jihadi John" travelled to Syria with his wife and four children under the noses of the UK security services, despite being on bail for alleged terrorism offences, it has emerged.
The family of British Muslim convert Siddhartha Dhar said last night that the killer seen shooting a prisoner in the head in the latest Islamic State of Iraq and the Levant (Isil) video could be the 32-year-old former bouncy castle salesman from east London.
Both Dhar's mother and sister said they had watched the video, released by Isil on Sunday, and noticed similarities between the voice of the masked jihadi and Dhar.
Dhar, who is also known as Abu Rumasayah, was arrested in September 2014 alongside the preacher Anjem Choudary on suspicion of belonging to the banned group al-Muhajiroun.
Choudary will appear in court on suspicion of terror offences next week, but Dhar will not be in the dock alongside him after fleeing Britain.
Just hours after being granted police bail, Dhar caught a bus to Paris with his family and then travelled on to Syria, where he joined Isil. He then taunted the British authorities by boasting of his new life in the self-styled caliphate and posted pictures on Twitter, showing him holding an AK-47 assault rifle in one arm and his baby son in the other.
Voice recognition experts working for the British security services were last night urgently scrutinising the Isil video amid the suggestion that the Islamist's voice matched that of Dhar.
Jihadi John, who was later identified as 27-year-old Mohamed Emwazi from London, was killed in a US drone strike last November.
Meanwhile, a child who also featured in the video was positively identified as the son of jihadi bride Grace Dare, from Lewisham, south-east London.
British Prime Minister David Cameron denounced the video as "despicable" but said people should watch it to remind themselves of Isil's "ghastly" tactics.
If Dhar's identity in the terrorist outrage is confirmed, it will lead to uncomfortable questions for the British security services, who allowed him to leave the country just hours after the police granted him bail.
Speaking at the family home, his mother, Sobita Dhar, said she could not rule out that the man in the video was her son. She said: "I heard the voice, yes, but I don't know, I'm not sure of the voice. These are the most difficult questions to answer. I just cannot say.
"I'm not sure within myself whether it is the truth or not."
His sister, Konika Dhar, from north London, said she did not want to believe her brother could be responsible for the outrage, but conceded the voice on the video "did sound like him".
She said: "I can't believe it. This is just so shocking for me. I don't know what the authorities are doing to confirm the identity, but I need to know if it is."
She said he had converted more than 10 years ago, and her memories of her brother are from when they were children and teenagers.
She said: "He was a very pleasant boy, and I know it may be hard to believe but he still is, and I still believe that he still can be that person."
She also pleaded with the UK authorities to provide an alternative for those who have been radicalised and travelled abroad, to help them return home.
Ms Dhar said: “If it is him, bloody hell, am I shocked? I am going to kill him myself. He is going to come back and I am going to kill him if he has done this.
Dhar, who was brought up a Hindu, ran a firm hiring out bouncy castles, before marrying his Muslim wife Aisha and becoming radicalised.
Former neighbours in Walthamstow, east London, claimed Dhar's wife was more devout than him and suggested she may have put him on the path to extremism.
In the months leading up to his arrest Dhar was accused of burning poppies and calling for the imposition of Sharia law in Britain.
He was an alleged key member of al-Muhajiroun and offshoot groups such as the Shariah Project, masterminding "roadshows" in London that aimed to recruit troubled youngsters to Islam. In one interview around that time, he said: "We believe that whenever the Sharia is established, the pure Islamic state, maybe in Iraq or Syria, one day the leader will wage jihad and annexe Britain into the Islamic state.
"We are not going to forget Europe, we are not going to forget Britain, the armies will be sent here to conquer these lands."
One former neighbour in east London, who asked not to be named, said: "He refused to talk to me - he was quite rude. He converted to marry her - it was her family that were more hardcore."
The Isil propaganda video was released on Sunday and showed the murder of five Syrian men, who were accused of spying for the British.
In the gruesome 10-and-a-half minute clip, the men, who are wearing orange jump suits, each confess to passing on information about Isil and its operatives. The video then shows the men kneeling in front of five masked gunmen in a desert landscape, before an Islamist with a British accent delivers his rant.
Using rhetoric similar to that Dhar has used in the past, the gunman dismissed Mr Cameron as an "imbecile" and said the RAF air strikes would have no impact against the Isil forces.
Dr Frederika Holmes, a forensic speech and voice analyst, said the sound quality would enable a positive identification.
In the video, released on social media, the masked gunman warned Mr Cameron that the West could never win in the war against Isil.
In the footage, the terrorist claims that one day Britain would be invaded, with everyone forced to live under strict Sharia law. (© Daily Telegraph, London)