A travel agency says one of its buses carrying Czech passengers from Slovakia to Prague has crashed, killing at least five people and injuring 18. The Student Agency says the accident occurred early Friday near the western Slovak town of Trencin. The company says three people were killed immediately and two others died later in a hospital. The victims have not been identified. The cause of the crash is under investigation, but Czech public radio has reported that the bus skidded off the road and overturned. The bus was carrying passengers from the Slovak town of Bardejov to Prague on a regular route. No further details were immediately available.