The United States has added four Indian groups to a list of what it considers to be terrorist organisations.
The US embassy in the Indian capital, Delhi, said the terrorist classification covered two communist groups - the Maoist Communist Centre of India and the People's War.
Two Sikh organisations - Babbar Khalsa International and the International Sikh Youth Federation - are also included on the US State Department list.
The listing means the groups' members can be denied entry to, or be deported from, America.
From the newsroom of the BBC World Service