Investigators questioned a group of Islamic preachers today in India’s remote north-east, searching for clues to last week’s deadly bombings on Mumbai’s commuter rail network.

A powerful explosive called RDX, often used by Islamic militants fighting in India’s part of Kashmir, was used in the Mumbai train bombings, an investigator said today.

An encephalitis outbreak has killed nearly 1,000 people – almost all of them children – in India and neighbouring Nepal, as too few doctors struggle to care for thousands of sick children in outdated hospitals.