A grieving son has hit out at motorbike-riding yobs for disrespecting the dead after they were caught on camera hurtling through a cemetery. Disgusted David France, 71, was laying flowers on his mother's grave at City Road Cemetery in Norfolk Park, Sheffield, South Yorks., when he spotted the bikers. He was so upset that they disturbed mourners that he reported them to South Yorkshire Police. Officers have now stepped up patrols in the area to try and catch the culprits.