Pavinya Nithiyakumar aged 19 months and Nigish Nithiyakumar aged three have both been named after being attacked with a knife in their home in Ilford.
Police found both of the small children who had been stabbed to death upon arriving on the scene at 5.30pm on Sunday in Aldborough Road North in East London.
Sadly Pavinya was found dead at the scene and Nigish later died within hospital.
A third person at the address a 40-year-old man was found with a knife injury and he remains in a critical condition with officers watching over his bed.
Scotland Yard has confirmed that everyone involved within the incident are all “known to each other”.
Scotland Yard confirmed to that their investigation is “at this early stage, police are not currently looking for anyone else in connection with this incident”.
However added that no formal arrest was yet to be made.
Specially trained Police officers are supporting the children’s mother.
“The ending of these innocent young lives is extraordinarily tragic and we are working hard to fully understand what may have caused this to happen,” said Detective Chief Inspector Vicky Tunstall.
“Whilst I know the effects of this crime are reverberating throughout the local community, please be reassured that we are not seeking any other person(s) in connection with the deaths and there is no cause for the community to be fearful or alarmed.”
Anyone with information should call 101 or tweet @MetCC, quoting CAD 5669/26 APR.
Alternatively, people can contact Crimestoppers, anonymously, on 0800 555 111.