Police have arrested a volunteer firefighter for allegedly starting deadly forest fires in Chile.

Elías Antonio Salazar, 39, is accused of deliberately starting the blazes because he wanted to be a “hero”.

The fires, which killed 137 people and destroyed 2,000 homes, triggered an official “state of catastrophe” around the central beach resort of Viña del Mar in February.

Mr Salazar is the third person to be arrested in connection with the fires, which prompted Gabriel Boric, the Chilean president, to declare: “All Chile is suffering and crying for its dead.”

The other two suspects, who have been in custody since May, are Francisco Ignacio Mondaca, another volunteer fireman, and Franco Pinto, a worker at the national forest agency.

Mr Pinto is accused of being the instigator because he wanted to earn overtime.

The trio are alleged to have co-ordinated throwing lit cigarettes from their cars onto bone-dry vegetation in at least three different spots around Viña del Mar.

They hatched the plot at the height of the southern summer amid a record heat wave.

Scientists blamed the high temperatures on a combination of the El Niño weather effect and climate change that had seen drought conditions and forest fires from Argentina to Mexico.

Following his arrest on Monday, Mr Salazar was immediately fired from his job at Senapred, the national disaster prevention and response agency.

Investigators also removed a computer and documents from his home.

Guillermo Gálvez, a senior detective, told journalists that Mr Salazar’s main motivation was that he liked to “participate and be a hero, helping out once the emergencies were happening”.

Mr Salazar had previously been disciplined, it was reported, for heading on his own to attend fires, in violation of strict firefighting protocol that required him to report for duty with colleagues.

He is due to appear in court on Tuesday.