Four people were injured Thursday when a small plane made an emergency landing on the outskirts of the Swedish capital Stockholm, news reports said, according to dpa. The pilot of the four-seat Piper Cherokee reported engine problems and made an emergency landing on the island of Djurgarden not far from downtown Stockholm, an emergency services spokesman told the online edition of tabloid Expressen. Police said at least one of the four sustained more serious injuries. Emergency services arrived quickly at the scene since they were undergoing a drill nearby.