there remain questions tonight about how a 12 year old girl and a 17 year old boy came to lose their lives after being pulled out of the sea off the coast of bournemouth yesterday. police have ruled out suggestions that they were hit by a vessel or that anyone was jumping from the pier. eight other people were treated on the beach for non life threatening injuries. a man in his 40s has been arrested on suspicion of manslaughter. duncan kennedyjoins us from bournemouth. duncan. there is a real sense of disbelief here about how a group of people playing in the sea can somehow get caught up in a tragedy like this. the police are not saying exactly what happened but they ruled out some things, like this group being hit by a jet ski or becoming injured byjumping off the pier here. whatever has gone on here, it has left two families grieving. for several hours, this part of bournemouth beach was transformed