Three persons were killed and around 30 others have been injured in a bus accident in central Sweden, media reports said on Sunday.The accident occurred on Sunday morning between Sveg and Fagelsjo in Harjedalen, central Sweden, Xinhua news agency reported."I have heard the horrifying news of the bus accident near Sveg. It leaves me and the entire country in mourning," Swedish Prime Minister Stefan Lofven said in a statement.Swedish Television quoted sources as reporting that the bus was carrying young people on their way to a ski trip. There were 59 persons on the bus, including 52 youth and seven adults.Among the injured, six people were in serious condition. All the wounded have been transported to a hospital.The bus was travelling in the northbound direction and ran off the road. Site pictures showed that the bus is on the side of a small slope to the road.Investigation teams have been set up to find out the reasons of the accident.