Indian authorities Wednesday set a daylong curfew in the western city of Jaipur, where a string of bomb blasts killed 80 people and wounded 200 others.
Seven bombs exploded Tuesday over a 12-minute period in the capital of Rajasthan state. The attacks happened during the evening rush hour near a Hindu temple and several crowded markets.
No one has claimed responsibility for the bombings. Police have questioned several suspects, but no arrests have been made.
Indian authorities have blamed similar attacks in recent years on Islamic militants. Police described Tuesday's blasts as a terrorist attack. The country's Home Minister Sriprakash Jawiswal told reporters there might have been -in his words- "some foreign hand in the blasts."
Authorities also placed two of India's largest cities, New Delhi and Mumbai, on high alert.
Prime Minister Manmohan Singh condemned the bombings and appealed for calm.
Two explosions last year in Hyderabad killed 43 people. Two years ago, seven bombings struck Mumbai's commuter rail network, killing nearly 200 people.