Police in Israel are investigating the latest in what seems to be a series of killings in Tel Aviv of young children by their parents. Police believe that 31-year-old Regina Kruchkov killed her four-year-old son Michael on Tuesday night by drowning him in the bath in their Tel Aviv apartment. Kruchkov's death joined the killing of four-year-old Alon Borisov - police believe he was drowned by his mother at a Tel Aviv beach last week - and the possible death of four-year-old Rose Pizem whose grandfather Ronny Ron told police he dropped her body into a Tel Aviv river.