Harrods boss Mohamed Al Fayed has abandoned his ten-year quest to prove Princess Diana and his son Dodi were murdered.The tycoon said he had reached his decision out of concern for Diana's sons Princes William and Harry.Mr Al Fayed said he accepted the inquest's verdict of unlawful killing through gross negligence "with reservations" and said: "Enough is enough."But he broke down in tears as he told how he still felt there was a plot against the couple.He said: "I'm a father who has lost his son and I've done everything for ten years."But now with the verdict I accept it, but with reservations. Enough is enough, for the sake of the two princes, who I know loved their mother."I am sure they are blessing in their deep heart what I'm doing to discover the truth. But I have had enough. I'm leaving the rest for God to get my revenge. I'm not doing anything any more this is the end."He said he was "tired" with his fight for justice despite his lawyers telling him he still had options.And he maintained his criticism of coroner Lord Justice Scott Baker for not exploring every aspect of the case.Diana and Dodi were killed alongside their driver Henri Paul when the Mercedes they were in slammed into the 13th pillar of the Alma Tunnel in Paris on August 31, 1997.An inquest jury of six women and five men jury singled out Mr Paul's drink-driving and the pursuing paparazzi as a contributory factor to the fatal crash.