Janbaz Tarin, 21, is being sought over the killings of his former partner, Raneem Oudeh, and her mother, Khaola Saleem.
The women, aged 22 and 49, were discovered with serious stab wounds in Northdown Road in Solihull, West Midlands, at 12.30am.
They were treated by emergency services but confirmed dead at the scene.
CCTV is being examined and the area has been cordoned off.
The victims’ family said in a statement they were devastated with the loss of our loved ones.
We would like to give thanks for all the love and support we have received, they added.
We kindly request that our privacy is respected at this difficult time.
Detective Inspector Caroline Corfield, who is leading the investigation, said We’ve been working flat out to apprehend Tarin since the early hours of this morning, following up a number of lines of enquiry.
As we have so far not been able to locate Tarin, I’m now asking for the public’s help in tracing him.
If anyone knows where he is or thinks they may have seen him, I’d urge them to ring 999 immediately.
If there’s anyone out there who may be shielding him through a sense of misguided loyalty, they need to be aware that they are committing an offence and will be prosecuted.
My message to Tarin would be that it’s vitally important that we get to speak to you as soon as possible, so please do the right thing and let us know where you are.
Chief Superintendent Bas Javid, Solihull policing commander, said tragedies such as the attack were incredibly rare but that did nothing to diminish the awful nature of what has happened.
I’m sure the thoughts of everyone in the borough and beyond will be with the family and friends of Raneem and Khaola, he added.
We’ll support them through the difficult times ahead, and will continue to work with the community to provide reassurance and support wherever it’s needed.
Police have encouraged anyone who sees Tarin not to approach him but to call 999.
The West Midlands force said it had referred itself to the Independent Office for Police Conduct, due to previous contact with the victims’ family.
News Source SkyNews