Ten seconds. That’s all it took to reduce June Taylor to tears as she walked into the underground station where her daughter was blown apart by a suicide bomber. I knew it would be a hard day for her and her husband, John, but the tears flowed so freely, it overwhelmed her and so did the anger.

Twenty-four-year-old Carrie Taylor died on July 7, 2005 as Shehzad Tanweer blew himself up just a few feet from where she stood on the train. The last thing she said to her Mom was "Don’t wait for tonight." But of course they did. Hour after hour they waited and waited for their daughter to call or come home. But it was only a police officer that knocked on their door that night.

By law, June and John Taylor weren't supposed to know that Shehzad Tanweer and an accomplice, Mohammed Siddique Khan were tagged and tailed by police a full 17 months before they detonated their bombs. A judge had forbidden us from reporting the evidence until there was a guilty verdict in the Crevice trial. But police and the media told the Taylors all about the evidence revealed in court at the fertilizer bomb trial. Tanweer and Khan were under surveillance and tracked at least four times. Police say they were dismissed as fraud artists and fundraisers for terrorists, not worthy of a costly round-the-clock surveillance operation.

In response to that, June Taylor looked me in the eyes and said: "They were all negligent, that’s the truth and I want them to stand up and admit it." June and John Taylor say the whole thing sickens them. The thought that their daughter could still be with them if police had taken Tanweer and Khan seriously.

Police and security services have responded by saying given the information they gathered on Tanweer and Khan, no one would have ever assumed they would one day become suicide bombers.

Police today wanted to concentrate instead on the impressive statistics about the terror plot they did manage to stop: The fertilizer bomb plot. They gathered 24,000 thousand hours of video and audio recordings during surveillance, 12,000 separate exhibits and it took as much as $100 million to see this case through.

The Taylors reminded me of their statistics too. It took 24 minutes for help to get to their daughter Carrie, 2 minutes for her to die after that help arrived, and 2 days to get their daughter's mangled body off the platform and finally refrigerated before it could be reclaimed by them for burial.

For the Taylors, it doesn't matter how significant the Crevice convictions are for police, for them it will always be about the ones that got away.

-- From International Security Correspondent Paula Newton.