A high stakes bid by the Venezuelan opposition to transport aid into the country turned deadly on Friday as government forces opened fire on a group of indigenous volunteers, killing at least one woman and injuring 12.

Members of the indigenous community in the southern town of Kumarakapay, bordering Brazil, on Friday night took the commander of the Venezuelan national guard prisoner in retaliation.

Jose Miguel Montoya Rodriguez was being detained by members of the Pemon tribe, following the death of Zoraida Rodriguez in the clashes.

The violence cast an ominous shadow over the massive aid delivery planned for Saturday, with hundreds of tonnes of medical supplies destined to be brought across the border from Brazil and Colombia.

Juan Guaido, the self-declared “interim president” who has marshalled the hugely symbolic aid delivery, condemned the killing of Rodriguez, and promised to bring the perpetrators to justice.

On Friday night, following a fundraising concert on the border organised by Sir Richard Branson, thousands of volunteers were preparing to bring the aid into Venezuela, in spite of the threats from President Nicolas Maduro that he would not allow it to pass.

Organisers of the show, held on the Tienditas bridge, worked through the night to clear the bridge ahead of the aid caravan. Mr Maduro promised a rival concert on the other side of the bridge, and was reportedly offering $7 million to artists to perform, but by Friday night there was no sign of the show and musician after musician issued statements confirming they had been approached to perform, but turned it down.