A curfew has been imposed in parts of the Indian city of Jaipur after eight blasts killed 63 people and injured 216.

The bombs, many of which were strapped to bicycles, exploded within minutes of each other at markets and near a main temple inside the pink-walled city.

Slippers, broken pieces of glass and pieces of bloody clothing can be seen strewn across the main market place.

The blasts have raised fears that Pakistani or Bangladeshi Islamist militant groups are trying to undermine a fragile peace process between India and Pakistan.

But officials said they still do not know which group was responsible for the bombings.

India's junior home minister Sriprakash Jaiswal said there "might be the involvement of some foreign hand in the blasts" - a phrase often used in India to refer to Pakistan.

"We have detained two to three persons for questioning," said Vasundhara Raje, chief minister of Rajasthan state. "We have got slender leads, but not a definite lead in the case."

Anil Saxena, a businessman at a popular jewellery market, said: "It was very scary and most of us just ran as there was smoke and cries for help in every direction."

Authorities cleaned a blood-splattered street in front of Hawa Mahal, or the "palace of wind", a five floor sandstone building built by a Hindu king for his queen in 1799 AD.

Many Hindus offer prayers in temples on Tuesdays and officials said the bombers were probably targeting those people.

"There were hundreds of people there like me to offer prayers. I wonder what would have happened had the blast taken place inside the temple," Vikram Singh, an injured college student, said from his hospital bed.

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