Jihadi's sister says 'I'll kill him myself' if he is masked fighter in IS video
The sister of jihadi Abu Rumaysah says she will "kill him myself" if he is confirmed as the masked Briton in a new Islamic State video in which five hostages are executed.
Konika Dhar, from north London, said she does not believe her brother, formerly known as Siddhartha Dhar, is the man in the video, but she conceded the voice sounded "a bit like him".
She said: "I don't think it is, personally, to be honest."
She went on: "I examined the features - one eye is smaller than the other, my brother has symmetrical eyes. The eyebrows are bushy and this guy is taller, my brother is shorter and he has got broader shoulders, but he has got stooped shoulders so I don't think it is.
"I think the voice sounds a bit like him, but it could be someone else, but he could have helped with a voiceover, but I have no idea."
She said she has not had contact with her brother in more than a year, saying she "doesn't even know who he is" any more.
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.
"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."
Ms Dhar said she had not seen her brother for around 15 months, when he reportedly travelled to Syria to join Islamic State. She had barely heard from him since, despite repeatedly emailing and phoning him.
She added: "I just feel as though I don't even know who my brother is any more. I haven't seen him in over a year.
"He has called just to speak to my mum a couple of times since he has gone out, just to say he is ok, but he would never say that he is not ok, so how can I know that he is?
"I just feel frustrated and I give up, because I feel, 'What do you want me to do to save him? What can I do to better the situation?'"
Ms Dhar, who is studying law, said despite the allegations of his involvement with IS he is still "human", saying: "Obviously with my brother's image it is very hard for people to understand that he is human too, but he really is.
"If you met him before he was nothing like this."
Ms Dhar condemned the threats made in the video, in which the masked figure labelled David Cameron an "imbecile" and a puppet of the US.
She said: "I don't know if it is him (her brother), and I hope it is not, but if it is, worse case scenario then he has made a direct threat to the prime minister, which is terrible and awful."
She also called on the Government to do more to help those who have been radicalised and provide a route for them to return to the UK, saying that her brother was "trapped" in a catch-22 situation.
She said: "We need to provide that alternative to the fighters out there and we need to make them realise that they are human too, they can still come back, as long as they are sorry and can abide by our laws and show a genuine attempt to want to become deradicalised."
Ms Dhar added: "I think it would be better if foreign fighters who are mainly British who have gone out there and realised their mistake can know that they can still come back.
"I would like to take on the project to deradicalise my brother. I think I can do it. But at the moment the way it looks as though it is a catch-22 situation - they can't do anything, they are trapped.
"You are not allowing them to come back, yet you are saying you can't preach whatever you want out there so we are going to (use a) drone (to attack) you, so what option are you giving them?"
Ms Dhar added: "They need to know it is not the end of the world and you can still come back.
"The reason why I say that is because when I last spoke to my brother, about a year ago, I was crying, saying, 'Why don't you just come home, you can live at our house, I will move out'.
"I was trying to give him a solution, an alternative, and then he said to me, 'Look, if I come back I will get arrested.'
"In hindsight I think, 'That is why you are not coming back, because you feel you can't?' Perhaps if he felt as though he could then maybe he might.
"It is a really bad situation at the moment, because I know with Islam if you leave you are an apostate so you get murdered. So they have got no way out.
"Literally my brother is trapped, so no matter what I say it won't have an impact, because it has come to the point where he can't do anything.
"So I think it is in the interests of our Government to provide that alternative solution to save further lives and just allow them a safe passage back into the UK."
Ms Dhar added that the young boy in the footage was not her nephew, her brother's son.
She said: "I can 100% say that it is definitely not my nephew, so I was more or less relieved, in a sense, and I hope that it is not.
"Unfortunately if it is I wouldn't be too happy about it and I'd like to see what more I could do."
Ms Dhar said her brother 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.
"I think it is important for him to realise and understand the person that he has become, and I want him to question himself and his actions in what he is doing, and to question whether this is truly him and what he really wants.
"I am still convinced that he doesn't really want to be involved in this, and I feel a bit guilty for what has happened, that I haven't done enough to stop things. If there is anything I can do I would like to do it.
"I still really miss him. He is still my brother and he will always be my brother, and I will always be his sister.
"He was just very pleasant, very amicable, very friendly."