The Guardia Civil has held a third person over the incident that led to an accident on the A-7 motorway in Los Barrios, near Algeciras, when a motorcycle patrol officer died while taking part in a drug-related chase.
The first arrests were made on 30 May, the same day the officer died, in Jerez de la Frontera when two people, of French and Moroccan nationality, were found with 200 kilos of hashish.
Their white Peugeot is alleged not to have stopped for the Guardia Civil patrol and one of the officers pursuing them fatally collided with a lorry.
A third person was detained the following day.
The dead officer, named as Fermín Cabeza González, was part of the road traffic patrol unit in Algeciras and the circumstances leading up to the accident are still under investigation. He had joined the Guardia Civil in 1991 and went on to be decorated more than once.
At the funeral held last Friday, the minister for the Interior, Fernando Grande-Marlaska, and the national director general of the Guardia Civil, Félix Azón, were present.
In Algeciras, and nearby San Roque and Los Barrios, there were silent protests over the tragic death.
The acting mayor of Algeciras, José Ignacio Landaluce, said that the protest there was to show support and solidarity for the security forces, especially the Guardia Civil. "We are saying goodbye to a great Guardia officer and we are saying goodbye to a great person," said Landaluce.