good afternoon and welcome to the bbc news at one. in the last hour, an inquest has concluded that police mistakes probably contributed to the death of three young men who were killed by a serial killer. the jury found that errors and omissions made by detectives after stephen port killed his first victim meant that he was free to kill three other young men before being caught. our home affairs correspondent daniel sandford has this report. four lives cruelly cut short by a serial killer. fashion student anthony walgate from hull, gabriel kovari from slovakia, young chef daniel whitworth from kent and forklift driverjack taylor from dagenham. all murdered with the date rape drug ghb. but the police could have stopped the killing. the men's bodies had all been discovered in the same small area of barking in east london over a period of less than a year and a quarter. but detectives simply didn'tjoin the dots.