Hunt for mystery Potters Bar workers

Police today launched a hunt for five rail workers said to have been seen close to the track points that led to the fatal crash at Potters Bar.

It is though the workers - who were seen wearing orange jackets - may have been the last to view the points that broke as a train passed over them at 100mph on 10 May. The rear half came off the track, killing seven.

It had been understood that the last time rail workers were on the track in the vicinity of the disaster was the day before, when maintenance company Jarvis conducted a visual inspection.

Now a driver has told police he saw the five rail workers in the vicinity of the crash just four and a half hours before the derailment.