An Indian-origin woman who stabbed her two teenage daughters to death at her house in Cambridgeshire was on Tuesday sentenced to 33 years in prison after she was found guilty of the murders.

Rekha Kumari-Baker, 41, admitted to the killings, but denied murder on the grounds of diminished responsibility. Davina Baker, 16, and Jasmine Baker, 13, were killed with a kitchen knife in a frenzied attack in 2007.

Earlier, a jury at Cambridge Crown Court took 30 minutes to reach a verdict of guilty on both counts of murder. The court was told that Davina was stabbed 39 times at on 13 June 2007. There were wounds on the girl’s body which showed she tried to defend herself. Kumari-Baker, a hotel worker, then attacked her younger daughter in a similar fashion.

The jury was told that after killing the children she rang a friend to say,”I have done something terrible.” In a hand-written note she left at the murder scene, she wrote, “I don’t want them to get hurt as I did.” She concluded by writing,”My kids will not be a burden to anyone anymore.”

One theory was Kumari-Baker wanted to “wreak havoc” on her ex-husband David Baker. She was also distressed by a break-up with her boyfriend Jeff Powell.

Kumari-Baker’s ex-husband, businessman David Baker, said “not a day passes” when he does not think of Davina and Jasmine. “I was robbed of my daughters by an act of calculated viciousness,” he said.