A man wanted in connection with the killing of his mother and sister in the Merseyside town of Bootle has been arrested at London's Euston station.
Bernadette Fox, 57, and her 27-year-old daughter Sarah Fox were found dead at two separate addresses in Bootle between 16 and 17 April.
A post-mortem revealed the mother died as a result of asphyxiation, whilst the daughter Fox died from multiple stab wounds.
Merseyside Police launched a murder investigation and said they wanted to speak to 26-year-old Peter Fox "urgently".
Police said Fox travelled down to London via Liverpool's Lime Street station on 15 April.
A man was arrested by British Transport Police at Euston Station on the morning of 20 April following a report from a member of the public.
Det chief inps Dave Rooney, said: "I can confirm that a 26-year-old man has been arrested on suspicion of the murders of Bernadette and Sarah Fox this morning and is being brought back to Merseyside.
"A significant amount of work has been carried out throughout the weekend with the Metropolitan Police and British Transport Police and I would like to thank them for their assistance.
"I would also like to thank the media and the public for their support during the weekend, which has helped us enormously."
A spokesperson for the family, said: "We are absolutely devastated following the loss of Bernadette and Sarah and are still trying to come to terms with what has happened to them both. We would urge anyone who has any information to contact the police as soon as possible to help them find justice for Bernadette and Sarah.
"Bernadette, who was a mother of three and grandmother of three, was a very outgoing and lovely person who wouldn't harm anyone. In fact she only ever had nice things to say about people. She was so caring and would help anyone.
"And Sarah was loved by her family and well-liked by her friends and neighbours. She was a fantastic aunty and was a cheeky, bubbly and outgoing person who loved her dog. They will both be greatly missed."