The Federal Bureau of Investigation (FBI) had received a tip three years before the 2008 Mumbai attacks that an American man who helped scout the targets was tied to the Pakistani group behind the plot, the Washington Post reported on Friday.
The man, David Headley, pleaded guilty in March to a dozen US terrorism charges related to the Mumbai attacks in which 166 people were killed, and to a plot to attack a Danish newspaper that had published cartoons in 2005 that lampooned the Prophet Mohammed.
He admitted to scouting the targets for the Islamist militant group Lashkar-e-Toiba (LeT) and agreed to help investigators and give testimony against others in exchange for a promise that he would not be extradited to India, Pakistan or Denmark.
The Washington Post reported that FBI received a tip in 2005 about Headleyâ€™s involvement from his wife after the two were in a domestic dispute that resulted in his arrest.
Headleyâ€™s wife told them he was active with LeT and had trained in Pakistan camps, the newspaper reported, citing unnamed officials and sources close to the case.
An FBI spokesman declined to comment on the report. The Washington Post reported that officials confirmed they did receive the tip from Headleyâ€™s wife at the time but would not discuss what they did with the information.
US authorities regularly receive tips about possible terrorism plots.