Forensic officers have arrived at a house in Huddersfield where a woman has been killed and four children injured. A 37-year-old woman was found with stab wounds at a home in Reinwood Road. She was taken to hospital but later died. Four children including a six-month-old baby were also injured.
A man in his 30s has been arrested in connection with the incident.
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The men, all aged 19, were arrested on Tuesday.
Zena Victoria Jackson, 43, and her six-year-old daughter Cidalia Mendes-Jackson died after being hit by a lorry on Spring Bank in April.
Andrew Broadhead, 42, and his eight-year-old daughter Kiera died in the blaze at their home in Stanley in October.