The murder took place earlier this morning, at around 10.30am, at the Horta das Cebolas farm in Monte dos Farelos, a sleepy hamlet of Alcoutim, near the Spanish border.

The suspect, aged 50, shot and killed his employer, also a Portuguese man said to be in his 50s, with a shot gun.

The suspect then left the scene and went to his home in nearby Pereiro, where he was later detained by GNR officers.

His car and gun have also been seized by the authorities. The investigation has been handed over to the PJ police.