As many as 21 people are feared dead following a bus crash in the western Mexican state of Nayarit.

A further 29 people are believed to have been injured in the incident, which occurred on the Chapalilla-Tequepexpan bridge.

The bridge links the cities of Tepic and Guadalajara.

The bus reportedly skidded off the road, with no other vehicles involved in the accident.

The service was operated by Express Oro Tours.

It was on route from Chihuahua in northern Mexico to the tourist area of Rincon de Guayabitos in Nayarit.