Environmental watchdog Greenpeace Sunday claimed that a woman official working with the NGO was stopped from boarding her flight to London at the airport here.
The official was scheduled to address British parliamentarians Jan 14 on the rights of forest communities in India "being infringed for coal mining", Greenpeace said in a statement.
Despite repeated attempts, immigration department officials at the airport were not available for comment.
Greenpeace India executive director Samit Aich said: "The government's intentions are clear. They are trying to intimidate and bully Greenpeace and its employees."
The statement said the NGO has written to the home and external affairs ministries and to the Airports Authority of India, after its employee was stopped in spite of having the appropriate documents.
