BBC News
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Police have described an assault on four teenage boys by a group of between 30 to 50 young people as an "unprovoked and vicious attack".
The attack happened on the East Strand beach in Portrush at about 19:30 BST on Saturday night.
Police said one of the victims was beaten with an object, possibly a hammer, while another was pushed into the sea.
The attackers attempted to hold the victim's head underwater.
The Police Service of Northern Ireland (PSNI) also said three of the boys were punched in the face, with one suffering a cut above his eye. Another of the friends was hit on the shoulder with a bottle.