A five-year-old boy from a migrant family drowned in the Una river in the night between Thursday and Friday when his family attempted to illegally enter Croatia from Bosnia and Herzegovina.

The tragedy took place in the northwestern Bosnian municipality of Novi Grad. Local police said that the family of illegal migrants from Afghanistan included the parents and four other children, all minors.

The boy who drowned apparently fell from his father arms while the family attempted to cross the river.

The district prosecutor's office has launched an investigation.