A father was arrested for murdering his children aged one and three.
Nineteen-month-old Pavinya Nithiyakumar and three-year-old Nigish Nithiyakumar died of knife wounds at their home in Ilford, east London, on Sunday.
A 40-year-old man, who is believed to be her father Nithin Kumar and is currently being hospitalized, was arrested on Wednesday and remains under police protection.
Police officers from the metropolitan area were called to the stabbing site around 5:30 p.m. after reports say that a man and two children were injured.
Pavinya was pronounced dead at the scene and Nigish was taken to the hospital, where he later died.
Nishanthani Kumar and Nithin Kumar (left) with their son Nigish and right Nigish and his sister Pabinya
Police at the scene of the tragic stab in East London on Sunday afternoon in Ilford
Detective Chief Inspector Vicky Tunstall said: “The end of this innocent young life is extremely tragic and we are working hard to fully understand what may have caused it.
"Although I know that the effects of this crime are having an impact on the entire local community, please be assured that we are not looking for any other people related to the deaths and there is no reason that the community is fearful or alarmed.
"I would like to hear from anyone who feels they have information that could assist our investigation to understand this terrible tragedy."
Scotland Yard is not looking for anyone in connection with the incident.
Earlier this week the broken-hearted mother of Pavinya and Nigish shared the terrible moment when she discovered her blood-soaked body.
Nishanthani Kumar sobbed hysterically as she remembered storming into a bedroom to discover her two young children lying on a blood-soaked bed when her alleged killer was kneeling over them with a large kitchen knife in hand.
40-year-old Nithin Kumar is pictured with his wife Nisa and their one-year-old daughter and three-year-old son, both of whom were killed in the terrible incident in Ilford, east London
When Ms. Kumar spoke to MailOnline yesterday, she complained: “I was in the bathroom and could hear one of my children vomiting. I hurried into the bedroom and when I saw that they were covered in blood, I just started screaming. I called & # 39; what did you do to them, what happened?
She said the man just knelt above them with a crazy look and didn't say a word. I couldn't understand what was going on. & # 39;
Ms. Kumar, known as Nisa, wept as she remembered the devastating events of Sunday afternoon, and when she saw that her beloved children had been stabbed to death, her mother's instinct came.
She shouted, "I ran to the fridge to get some ice cream because I could see that my son had a deep cut on the neck. Blood gushed out. I ran back to the bedroom and started putting the ice on his neck. He could hardly breathe and gasped heavily.
Nithin Kumar (pictured) is in the hospital after a one-year-old and a three-year-old died on Sunday
& # 39; My daughter didn't move at all. There was blood all around them. I could only think about how to save her. & # 39;
The troubled mother then ran to the bathroom to dial 999 when the suspect jumped off the bed and chased her.
She said, "I thought he was going to attack me too, so I hit and the knife fell out of his hand. I then ran out of the bathroom and shouted to the 999 driver that they would have to send an ambulance quickly because my children had been stabbed. & # 39;
When she returned to be with her dying children, she said the killer then came out of the bathroom and blood spurted from the back of his neck. Then he slumped next to the bed.
She told his haunted words and said to MailOnline: "He kept saying:" I'm sorry, I'm afraid that they could kill me and do something to the children. "He spoke like a madman and kept talking about" how they'll get him "and that he" had to save the children ". I couldn't understand what he was saying. And then he passed out."
The police, pictured on site on Sunday, are currently conducting a murder investigation – but said that all three people knew each other
Pictured: teddy bears in a window at the scene of the crime as the police investigate the deaths of a three-year-old boy and a one-year-old girl who were stabbed to death in a suspected attempted suicide
Ms. Kumar, 35, believes the man had a "psychotic episode" of sorts, although he had no mental illness in the past.
She said: “He was a kind, gentle man and spoke very quietly. None of that makes sense. Now everything is lost. & # 39;
The grieving mother shared with MailOnline her favorite picture of her children, which was taken last September on Pabinya's first birthday.
She said, "That's how I want to remember her. Smile, happy and play together. We had a nice day and the whole family came over to celebrate. Pabinya received all of these wonderful gifts and Nigish was also very excited because he was helping her open them.
"But I keep seeing her on this bed, full of blood and Nigish struggling to breathe. I can't sleep at night because this picture keeps coming to my mind. It's like the worst nightmare you can imagine. There are no words to describe what I'm going through. I don't understand why God punished me like this. & # 39;
The Kumars got married in their home country Sri Lanka in 2012 in a traditionally arranged marriage. Mr Kumar has been in the UK since 1999 and his wife came to him in 2015. Both children were born in the UK.
There was a steady influx of mourners from the local Sri Lankan community who were visiting to show their respect.
Ms. Kumar sobbed that despite her anger she regularly calls the hospital to find out about her husband's condition.
When she tries to come to terms with her devastating loss, she shouted, "I don't know how to deal with him at the moment, but I want to know if he will live or not. I lost my children and now I could become a widow.
“When I came to my husband in the UK, I thought we would be happy. There is nothing that can express the shock and sadness that I feel. My children were my life. Sometimes I wished I had killed because then I wouldn't have to go through this kind of pain. & # 39;
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