The story

The United States warned the Indian government about a potential maritime attack against Mumbai at least a month before last week's massacre in the country's financial capital left nearly 180 dead, a U.S. counterterrorism official told CNN.

U.S. intelligence indicated that a group might enter the country by water and launch an attack on Mumbai, said the source, who refused to be identified due to the ongoing investigation into the attacks and the sensitivity of the information.

Indian security forces have confirmed to CNN that not only did U.S. officials warn them of a water-borne attack in Mumbai -- they were told twice. The area entered a higher state of alert for a week, including tightened security measures at hotels, but those efforts were eventually reduced, Indian officials said.

Local fisherman in Mumbai said they witnessed a group of gunmen dock their boat Wednesday night, before heading toward the busy causeway.

Also, sources have told CNN-IBN that officials found phones and a global navigational device on an abandoned boat floating off the coast of Mumbai. The boat had been hijacked, intelligence officials told CNN-IBN. Watch Nic Robertson's report about U.S. warning Read full article »

CNN's Senior International Correspondent Nic Robertson contributed to this report.

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