An Indian-origin man has been arrested by Scotland Yard on suspicion of brutally murdering a one-year-old boy and critically injuring the toddler's twin sister, believed to be his children, in north east london.
Bidhya Sagar Das, 33, had been on the run after the toddlers were attacked on Saturday, in what police are describing as a suspected "domestic" incident.
The Metropolitan Police's Homicide and Major Crime Command had launched a major manhunt for Sagar and arrested him after 20 hours on Tuesday.
"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. A baby girl currently remains in a critical condition and is receiving specialist medical care," said Detective Chief Inspector Dave Whellams, of the Met's Homicide and Major Crime Command.
"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 said.
Sagar has been taken to an east london police station, where he remains in custody.
"Next of kin are aware. Formal identification awaits and a post-mortem examination will be scheduled in due course. The incident is believed to be domestic. Enquiries continue," the Met Police statement said.