Authorities imposed a dawn-to-dusk curfew in parts of India's historic western city of Jaipur today after eight bombs went off last night, killing 61 people and injuring 216.
Bombs, many strapped to bicycles, exploded by a main temple and markets inside the pink-walled city.
The blasts within minutes of each other brought fears that Pakistani or Bangladeshi Islamist militant groups were trying to undermine a fragile peace process between India and Pakistan. But police have not yet blamed any particular group.
India's junior home minister Sriprakash Jaiswal was quoted by local media as saying there "might be the involvement of some foreign hand in the blasts" - a phrase often used in India to refer to Pakistan.
Indian Foreign Minister Pranab Mukherjee is due to visit Islamabad in a week's time to review a four-year-old peace process between the two nations, and Pakistan quickly condemned the blasts.
"Pakistan condemns all acts of terrorism," Prime Minister Yousaf Raza Gilani said in a statement.
In the past few years, bomb blasts in Indian cities have killed hundreds of people. The deadliest was in July 2006, when seven bombs exploded on Mumbai's railway system, killing more than 180 people.