Early official result showed the ruling Movement for Socialism (MAS) on track for its worst election defeat in a generation.

Centrist Rodrigo Paz and right-wing Jorge “Tuto” Quiroga won the most votes, marking the end of a socialist era where leftist Evo Morales dominated for nearly 20 years.

Bolivia is heading for an unprecedented presidential run-off election between centrist and conservative candidates in October after preliminary results showed a collapse for the ruling leftwing Movimiento al Socialismo for the first time in 20 years.