A 16-year-old has been detained on suspicion of shooting and killing three people in Sweden, prosecutors have said. A murder investigation was launched following the incident in the city of Uppsala on Tuesday. Witnesses told local media they heard five shots and saw people in the area running to take cover. Police said on Tuesday it was investigating the shooting as a homicide and that it had no information about whether it was a terror or hate crime-related incident at that point. A spokesperson for the force said it had information someone had left the scene on an electric scooter - it was unclear whether they were a suspect, witness or otherwise. Electric scooters have been used several times as a mode of transport after gang shootings in the country. Uppsala, a city around 70km (43 miles) north of the capital Stockholm, has seen a number of gang-related shootings in the past decade, but usually outside the city centre. Local media reported that the attack took place near or in a hairdresser's. This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow us on WhatsApp and subscribe to our YouTube channel to keep up with the latest news.