The parents of one of the two French students murdered in London a week ago in a frenzied knife attack appealed on Sunday for the killer to come forward and said they would not rest until the guilty party was found.
Bio-engineering students Laurent Bonomo and Gabriel Ferez, both 23, were bound, gagged and repeatedly stabbed in Bonomo's south London apartment in what police said were the most "frenzied, brutal and horrific" murders they had seen.
Police arrested a 21-year-old man on Saturday in connection with the murders and were still questioning him on Sunday. French newspapers said the shocking murders highlighted how dangerous the city had become after a spate of street teen stabbings this year that has prompted the mayor to make it a priority and police to expand a specialist knife crime squad.