The head of Greenpeace UK has been barred from entering Indonesia, where the environmental group has been fighting deforestation, campaigners have said.
Greenpeace said John Sauven was blocked from entering the country on arrival in the capital Jakarta, and would be deported, despite having a business visa for the trip.
The environmental organisation said it had stepped up campaigns in the last year to protect Indonesia's rainforests from being cut down to make paper and provide land for palm oil plantations.
It has targeted companies including Asia Pulp and Paper (APP) which it claims are helping drive deforestation.
Mr Sauven had been due to meet a high ranking Indonesian government official and visit rainforests in Sumatra, home to some of the world's last orangutans and Sumatran tigers and a significant store of carbon.
Bustar Maitar, head of Greenpeace's campaign to save Indonesia's forests, said: "Greenpeace has faced a number of attacks since we stepped up our campaign earlier this year to save the rainforests of Indonesia."
But he said efforts to block Greenpeace campaigners would not stop customers from cutting their ties with companies over concerns about rainforest destruction.
Companies including Tesco have dropped APP as a paper and packaging supplier because they say they cannot satisfy themselves over the sustainability of the source of the materials.