A 21-year-old man has been arrested on suspicion of the murder of a mother and daughter.
Raneem Oudeh, 22, and Khaola Saleem, 49, were found stabbed to death outside their home in Solihull on Monday.
West Midlands Police said it arrested the man in the Sparkhill area of Birmingham at about 22:00 BST on Thursday.
Ms Oudeh’s ex-partner Janbaz Tarin, 21, had been named as a suspect in the investigation.
Officers launched a murder inquiry after the women’s bodies were found in Northdown Road in the early hours of Monday morning.
The force put out several appeals and independent charity Crimestoppers offered a £5,000 reward for information leading to an arrest.
The women were pronounced dead outside Khaola Saleem’s house
Computer equipment, mobile phones and a van were seized during raids at addresses in Birmingham and detectives said a suspected murder weapon had also been recovered.
Det Insp Caroline Corfield thanked the community for its support and said: “The response to our appeals has been excellent and tonight resulted in this arrest.”
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Ms Oudeh, who has a two-year-old son, and Mrs Saleem, who has five other children, were born in Syria.
A number of calls had been made by Ms Oudeh to the police on Sunday evening. During one of the calls, the situation “quickly escalated” and officers were sent out immediately, police said.
Ms Oudeh’s ex-partner Janbaz Tarin had been named as a suspect in the investigation
Police said their relatives had been informed of the arrest.
West Midlands Police has referred itself to the Independent Office for Police Conduct as it had previous contact with the victims’ family.