A SENIOR police officer killed his wife and six-year-old girl in a frenzied attack on his family just days after he had been sacked.
Tobias Day (37) also left his two other children with serious injuries before killing himself, detectives believe.
The horror attack at his semi-detached home yesterday is believed to have been fuelled by his dismissal by Leicestershire Police on Thursday for misusing the force's computer systems.
Neighbours and colleagues spoke of their shock over the actions of the "respected" former inspector as police confirmed that he had been fired for "matters concerning honesty and integrity".
Day killed his teacher wife Samantha and youngest daughter Genevieve, as well as attacking Kimberley (15) and Adam (13).
He then took his own life.
Post-mortems today are expected to reveal whether the victims were stabbed.
The two surviving children are in serious but stable conditions at the Queen's Medical Centre in Nottingham.
Residents on the Days' quiet residential street in Melton Mowbray were said to have heard screams coming from the house.
Neighbour Gavin Lucas said Day was well known in the area.
He said: "I saw Toby out jogging and with his children. He was a good bloke, always said hello. I wouldn't have expected this from him.
"My auntie lives next door to me and she told me she heard screaming."
Police were alerted to the attack at around 4.23pm following reports that the eldest girl, Kimberley, had been injured. She was taken to hospital as officers forced their way into the house to find the four remaining family members.
Ivan Stafford, chairman of Leicestershire Police Federation, spoke of his shock, saying Day had been "a very capable and respected inspector".
"It's absolutely tragic what has happened," he said. "It's been a real shock to the country and to Melton.
"It has had a huge impact on the force and it is important we have time to get to grips with what's happened.
"We are more concerned for the two remaining children. Our thoughts are with the family."
Neighbour Samantha Whitfield, who has lived on Robin Crescent with her husband for around 15 years, said she was horrified.
"It's usually a quiet street," she said. "I've never seen anything like this.
"When we saw all the police and ambulances yesterday, we knew something had happened."
She said her two children had been scared by the events.
"They were a normal family from what I saw. I didn't see him too much."
The Independent Police Complaints Commission is assessing the circumstances of his sacking before a decision is made over a formal external investigation.
The police watchdog is not understood to have been told of any complaints to police surrounding the family's welfare after Day's sacking.