Tunisia said it inspected a Turkish plane headed for Libya with medical aid that landed at an airport near the border.
The aircraft was authorised to land at Djerba airport in the country's south, the Tunisian presidency said in statements issued Thursday and Friday.
Tunisia had requested its authorities be in charge of checking the cargo and handing it over at the Ras Jedir border post with Libya.
The presidency did not specify the day of the operation.
According to local media, Turkish authorities had failed to inform Tunisia of their plans to deliver the aid.
Turkey supports Libya's UN-recognised Government of National Accord in its battle against forces of eastern-based Libyan National Army’s (LNA) Commander Field Marshal Khalifa Haftar.
World leaders at a Berlin meeting in January committed to ending foreign meddling in Libya and to upholding a 2011 weapons embargo.
But the United Nations has warned that both sides have continued to receive arms and fighters.