A boy has been injured during an "altercation" on a beach involving about 50 people on the hottest day of the year. Police were called to Margate in Kent at about 13:15 BST on Saturday and arrested a man on suspicion of racially aggravated assault. The beach was filled with people as temperatures reached up to 30C. The 43-year-old man, from St Albans in Hertfordshire, has been released under investigation, Kent Police said.