A man has been arrested on suspicion of attempted murder following a serious collision which saw both vehicles catch alight. Detectives have praised members of the public who saved lives by pulling casualties free of the burning cars. The collision took place on the A39 near Barnstaple at 9.55pm when a Seat Ibiza and a red Ford Focus collided and caught fire near Roundswell. All four occupants of the Focus - a man, woman and two children from Bideford - were taken to North Devon District Hospital. The 42-year-old man suffered serious arm injuries and the woman serious foot injuries, and both required surgery. Two children were very distressed but otherwise uninjured. The driver of the Seat, a 26-year-old man from Torrington, was taken to hospital and on release on Sunday, was arrested on suspicion of attempted murder and dangerous driving. Detectives from Barnstaple CID and the Force Serious Collisions Investigation Unit have launched a joint investigation into the circumstances of the collision. Detective Sergeant Simon Butler, of Barnstaple CID, said: This was an extremely serious collision and all of the occupants are lucky to be alive. I would praise the actions of the members of the public who pulled the casualties free from the vehicles - they almost certainly saved their lives. We are investigating the circumstances surrounding the collision and we are appealing for any witnesses who have not yet spoken to police to come forward. We are also keen to speak to anyone who saw either of the vehicles travelling on the A39 prior to the collision. The man was interviewed at Barnstaple police station and has been bailed until September 30. Anyone who can assist with the investigation is asked to contact police by phone on 101 or email at firstname.lastname@example.org quoting log number 944 of 31\/07\/15.