https://apnews.com/91359ad0fdf81b78fc3cac1aa3f2fdcc > BERLIN (AP) — The U.N. nuclear agency says slightly elevated levels of radioactivity that have been detected in northern Europe pose no risk to human health or to the environment but it's still unclear what the cause was. > The Finnish, Norwegian and Swedish radiation and nuclear safety watchdogs said last week that they had spotted small amounts of radioactive isotopes in parts of Finland, southern Scandinavia and the Arctic.