The federal government warned Maharashtra officials that places of worship, strategic installations and trains could be targeted in Bombay, a city already on edge following the July 11 bombings that killed 207 people and wounded more than 800, the Times of India reported.
The Times, citing unidentified officials, also said that there were concerns about possible attacks in New Delhi, and that a manhunt was under way for militants suspected of plotting such attacks, the AP reports.
Meanwhile, it remained difficult Thursday to access Internet Web logs or blogs blocked by Indian authorities two days after the bombings.
The Web sites were blocked two days after the bombings in an effort to stop extremists from stirring up religious violence that has sporadically plagued Hindu-Muslim relations in India.
Angry Internet users and software executives have since pressured the government to reopen access to the sites.
Investigators say they are following leads throughout India, including in the northeastern state of Tripura, where they questioned 11 Muslim preachers who have spent the past three weeks delivering sermons in remote villages along the Bangladesh border.
Authorities fear Muslim militants might be smuggling weapons and munitions across the frontier, according to the AP.
Police also said they were questioning five men detained elsewhere in the northeast to see if they were connected to the blasts.
Police also were using DNA tests to identify a badly mutilated body - the last one unclaimed from the blasts - to see if it could be one of the bombers, Raghuvanshi said.
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