According to CNN, United States intelligence agencies had warned India "twice" about a potential maritime attack on Mumbai at least a month before the terror hit the financial capital of India leaving approximately hundred dead and three hundred injured.

"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," the CNN quoted a US counter-terrorism official as saying.

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

"Indian security forces have confirmed to CNN that not only did US 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," the network maintained.

Another government source revealed that specific locations, including the Taj Hotel, were mentioned in the US warning.