In India, negotiations to secure the release of two Italian tourists have been suspended.
Paolo Bosusco and Claudio Colangelo were abducted by Maoist rebels last week after taking photos of bathing women from an indigenous tribe on a tour of the state of Orissa.
The Maoists also reportedly kidnapped a provincial politician on his way home from work.
Maoists have waged a decades-long conflict against the central authorities. They regularly stage ambushes in eastern and central parts of India.