Indian officials have ordered increased security after a wave of synchronized bombs in the western city of Ahmedabad that killed at least 45 people and wounded more than 161.
A little-known group has claimed responsibility for the attack, which saw 16 bombs go off in several crowded neighbourhoods.
Police said they detained 30 people in their investigation.
Cities around the country were put on alert and security was stepped up at markets, hospitals, airports and train stations.
An email from the Indian Mujahedeen, sent to several Indian television stations minutes before the blasts began read: "In the name of Allah the Indian Mujahedeen strike again! Do whatever you can, within five minutes from now, feel the terror of Death!"
Ahmedabad was the scene of sectarian violence between Hindus and Muslims in 2002 which left hundreds dead.
AP / RadioLIVE