A man suspected of murdering his family and going on the run has been pictured in a CCTV image - as police also shared a photo of the victims.
Ndodana Mkhanyisi Tshuma is thought to have fled to Zimbabwe two days before his wife and daughters were found dead.
Police forced entry into their house in Great Denham, Bedfordshire, after Nothabo Zandile Tshuma, 42, Natalie, 15, and Nala, five, hadn't been seen for several days.
The suspect, who goes by the name Mark, is from Bedford and is a British citizen of Zimbabwean heritage.
Officers believe the 45-year-old flew from London Heathrow to Zimbabwe on Saturday.
Detective Inspector Lee Martin appealed directly to the suspect to hand himself in.
"Unthinkable harm has been caused to those around you," he said.
"Three innocent people have lost their lives in the worst possible circumstances, leaving your relatives and friends devastated."
"We are throwing the full weight of the law behind this investigation. Criminal investigations know no borders," DI Martin added.
"We are actively working with national and intentional agencies to pursue every available line of inquiry to track you down - and we will find you.
"So please do the right thing. Come forward and hand yourself in to local authorities."
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Nala's school, Pilgrims Pre Prep in Bedford, called her "a much-loved member of our school community [who] brought joy to those around her every day".
"Many of our staff had known her since she was just seven months old and had the privilege of watching her grow," said head teacher Jo Webster.
"She was a little ray of sunshine, known for her inquisitive and bubbly nature, her positivity, happiness and her wonderful sense of humour."
Anyone with information is asked to contact police on 101, or go via Crimestoppers on 0800 555111 to stay anonymous.
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