Yesterday 17 bombings hit Ahmedabad in western India, the site of previous sectarian violence and the day before 4 bombings hit Bangalore.
India's president and prime minister have appealed for calm after a series of explosions killed at least 45 people in the western city of Ahmedabad.
President Pratibha Patil urged people to "remain steadfast in this testing time and maintain peace and harmony".
Ahmedabad was the scene of sectarian violence between Hindus and Muslims in early 2002 which left hundreds dead.
On Saturday, 17 blasts within an hour struck residential areas, market places, public transport and hospitals.
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