India on high alert
Indian cities are on high alert as police hunt for those responsible for the blast in the northern holy city of Varanasi, which killed a one-year-old girl and wounded at least 34 people.
An Islamist militant group, the Indian Mujahideen, has sent an email saying it was behind the explosion.
Reports said that it was sent from a computer in a suburb of Mumbai, and that police had been sent to the area.
Two people were questioned about it and released later, reports said.
"We are taking the email seriously," D Singh, a senior police official of Uttar Pradesh state, where Varanasi is located, said.
Federal Home Minister P Chidambaram visited the site of the blast and spoke to local police officials.
Tuesday evening's incident happened when a small, improvised device hidden in a milk canister at a bathing point on the banks of the River Ganges near the Vishwanath temple exploded, police said.
The injured included Hindu worshippers attending an evening prayer ceremony.
The explosion occurred at about 1830 (1300 GMT) on Tuesday, and struck those attending the Ganga aarti prayer ceremony at the Shitla ghat - one of the many stone staircases which lead down to the Ganges.
The powerful explosion shook nearby buildings and knocked over iron railings around the Vishwanath temple. Stone walls up to 60m (200ft) away were damaged.
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