British emergency services said a man had been arrested after at least eight people were stabbed in Southport, northwest England, on Monday, with a local children's hospital declaring a major incident and the prime minister calling it "deeply shocking." North West Ambulance Service said it had treated eight patients with stab injuries who had been taken to three different hospitals, including Alder Hey Children's Hospital. Merseyside Police said armed police had arrested a man and seized a knife after being called to reports of a stabbing at around 11.50 a.m. (1050 GMT). There was no wider threat to the public, they added.