hat ripped through this historic Indian city and killed 61 people. All three are suspected of buying either the bicycles investigators think may have been used in the bombings on Jaipur's crowded streets, or the satchels in which the explosives were hidden, said police official Raghvendra Suhasa in an e-mail to reporters late Thursday.
The sketch of another suspect was released the day before.
Police say all four suspects are aged from 18 to 25. The sketches show clean shaven men with short hair.
A previously unknown Islamic militant group claimed in videos and an e-mail sent to Indian television stations Thursday to have orchestrated Tuesday's bombings, but officials said they were unsure of the veracity of the claims.
"Some of the (video) footage may have been meant to mislead," said Vasundhara Raje, the chief minister of Rajasthan state where Jaipur is located. He said intelligence officers were examining the videos and the e-mail.
The e-mail, a copy of which was obtained by The Associated Press, came with videos that show a bicycle with an alleged bomb strapped to it parked in a crowded market.
The e-mail message also had an attached Microsoft Word document purportedly written by a Guru al-Hindi, who claims to be from a previously unknown group calling itself the Indian Mujahedeen.
"This letter is an open warning to India (to) stop supporting (the) U.S. in the international arena, and if you do continue then get ready to face more attacks at other important tourist places," wrote Guru-Al-Hindi, which is a blend of Hindi and Arabic that means teacher of Indians.
The attack came at the height of the Indian summer when there were few tourists in Jaipur. No foreigners were reported killed or wounded in the bombings, which targeted Hindus and Muslims alike.
Oddly, the message also included the password for the French Yahoo account used to send the e-mail.
The oldest e-mail currently in the account's inbox was received about two hours after the first of nine bombs went off. Other more recent messages include queries from Indian journalists and a number of scam e-mails requesting help moving large sums of money from fictitious African banks.
Apart from targeting a tourist center, officials have said they believe the attacks were also intended to stoke tensions between India's Hindu majority and its Muslim minority.
