Nadarajah Nithiyakumar, 41, attacked his daughter and son at home on April 26
His wife Nisanthini was in the shower at time and ran to her children s screams
Court heard shopkeeper Nithiyakumar was upset by customers blowing alcohol fumes in his face and claims he was being followed by Scotland Yard
He pleaded guilty to two counts of manslaughter by diminished responsibility
Judge at the Old Bailey sent him to psychiatric hospital for treatment indefinitely