A MAN has been arrested after a boy, 1, was killed and a girl, 1, was critically injured.
Police have arrested 33-year-old Bidhya Sagar Das, who is understood to be the children’s father.
The children, named locally as Gabriel and Maria, were rushed to hospital after the attack at a flat in Wilberforce Road, Hackney, but the boy could not be saved and he died just before 1am on Sunday.
The girl remains in hospital in a critical condition.
Das, who lives at the flat where they were found, was arrested in the Hackney area on suspicion of murder and attempted murder on Sunday evening.
Forensic officers are examining a hammer reportedly found dumped in a bag of sand near the apartment.
The Met would not comment on its relevance in the investigation.
Scotland Yard said officers were alerted to the incident at 11.10pm on Saturday.
Police said Das left the flat shortly before the emergency services were called.
Medics rushed the injured children, believed to be twins, to the Royal London Hospital.
One child was taken to the hospital by air ambulance and the other by ambulance.
The boy was pronounced dead shortly before 1am in hospital.
DCI Dave Whellams, of the Homicide and Major Crime Command, said: "This is clearly a tragic incident, and our thoughts are with the family of the two young children.
“Despite the best efforts of medical professionals a baby boy sadly died in the early hours of this morning. A baby girl currently remains in a critical condition and is receiving specialist medical care.
"Whilst we remain in the early stages of the investigation, a man has now been arrested.
"I would still like to hear from anyone who may have any information regarding this terrible incident.”
He added the incident is believed to be domestic.
Anyone with information that may assist the investigation is asked to contact the incident room on 020 8345 3775 or Crimestoppers on 0800 555 111.