A 21-year-old man has been arrested on suspicion of the murders of a mother and daughter.
On Monday, 22-year-old Raneem Oudeh and 49-year-old Khaola Saleem were discovered stabbed to death outside their home in Solihull.
West Midlands Police claimed to have arrested the man in the Sparkhill area of Birmingham at around 22:00 BST on Thursday.
Oudeh's ex-partner, 21-year-old Janbaz Tarin, had been named as a suspect in the case.
Officers began a murder investigation after the women's bodies were found on Northdown Road early on Monday morning.
The force sent out multiple appeals and independent charity Crimestoppers offered £5,000 for information leading to an arrest.
Computer equipment, mobile phones and a van were seized during raids at addresses in Birmingham and detectives claimed that they had also found a suspected murder weapon.
Detective Inspector Caroline Corfield offered thanks to the community for its support, and said that 'The response to our appeals has been excellent and tonight resulted in this arrest.'
Oudeh, mother to a two-year-old son, and Saleem, who has five other children, are originally from Syria.
According to the Telegraph, Qudeh made several phone calls to the police the night she was killed to report domestic abuse. Officers responded to the first of these, but were unable to locate her. They did not attend in person when responding to the subsequent ones, with the exception of the final one. The second time they responded, the bodies were found.
Police said that during one of the calls, the situation 'quickly escalated', and officers were immediately dispatched.
Detective Chief Superintendent Mark Payne, to defend the actions of the force, said 'Unfortunately we can't always be everywhere and on the night in question we did our absolute best, but we weren't able to get there in time to prevent a double murder.'
Police claimed that their relatives had been informed of the arrest.
West Midlands Police has referred itself to the Office for Police Conduct as it had previously had contact with the victim's family.