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(CNN) -- The United States warned the Indian government about a potential maritime attack against Mumbai at least a month before last week's massacre left 179 dead, a U.S. counterterrorism official told CNN.

U.S. intelligence indicated a group might enter the country by water and launch an attack on Mumbai, said the source, speaking on the condition of anonymity.

Indian authorities said they believe last week's attackers arrived by boat Wednesday. 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 sister station 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. Four crew members who had been aboard were missing. The captain was found dead, lying face down with his hands bound behind his back.

India made clear it believes the Mumbai attacks originated in Pakistan, but the Indian government is under pressure to explain the lapse of security that allowed the siege to occur.

Indian police say 179 people were killed in the attacks on 10 targets in Mumbai. Most of the deaths occurred at the city's top two hotels, the Oberoi and the Taj Mahal.

Pakistani authorities say Islamabad has not received any evidence that militants from within its borders carried out the attacks, but have vowed to fully cooperate in the investigation. Suspicion has fallen on Lashkar-e-Tayyiba, a Pakistan-based terror group allied with al Qaeda, even though it has denied responsibility for the attacks.