A mother was heard screaming "my kids, my kids" after a one-year-old boy was killed and a girl of the same age left fighting for life in an alleged hammer attack.

On Sunday night arrested a man, believed to be the mother's partner, after a major search.

Scotland Yard said Bidhya Sagar Das, 33, was arrested on suspicion of the murder of a one-year-old boy and the attempted murder of a girl of the same age at a flat near Finsbury Park, north London.

Das was at the property where the children were injured but left before police and ambulance crews arrived.

Both toddlers were discovered with critical injuries at the address on Saturday night and were taken to an east London hospital, where the boy died in the early hours of Sunday morning.

Police said that the suspected murder, at a flat in north London on Saturday night, is believed to be domestic.