Updated

Police in Santa Barbara, California, are investigating after 27 people who ran a half-marathon in the city on Sunday were treated for unusual symptoms at emergency rooms. Santa Barbara Cottage Hospital, which treated them in Santa Barbara and the nearby city of Goleta, reported a larger than expected number of emergency visits after the race ended. By Monday, 24 of those treated had been discharged and three remained in hospital in stable condition. Several thousand people took part in the race, which ran along the Pacific Ocean on a hotter than usual day, with temperatures reportedly reaching 86F (27C) by midday compared with a typical early November level in the low 70s. Police said the cause of the symptoms has not been confirmed and that no specific action is recommended for the public, though participants who feel unwell should seek medical attention. One runner told KEYT-TV that they lost consciousness and could not remember parts of the race, and event director David Monico said 15 people were taken from the medical tent to hospitals for dehydration and overheating. The BBC contacted police, the hospital and organisers for further comment.