Des Moines Register reporter Aaron Calvin has lost his job after his profile of Carson King triggered fury.

The newspaper has been forced to hire extra security due to threats.

The story has provoked a debate on US "cancel culture", where public figures are hounded for causing offence.

Carson King, an Iowa State University football fan, found unexpected fame on 14 September after his hand-drawn cardboard sign requesting donations for his "Busch Light Supply" was featured in the background of an ESPN broadcast.

After initially receiving around $600 from amused sports fans, the 24-year-old announced the money would be donated to the local children's hospital, causing donations to skyrocket.