Sources close to the case have revealed to Washington Post that the Federal Bureau of Investigation (FBI) was warned by Headley's wife in Aug 2005 that her husband was in contact with extremists.
She reportedly told the Bureau that Headley had also undergone intensive training with Lashkar-e-Toiba. She told the FBI that Headley "was an active militant in the terrorist group Lashkar-e-Taiba, had trained extensively in its Pakistani camps, and had shopped for night vision goggles," the report stated.
According to the Post report co-authored with journalism foundation ProPublica, Headley's wife called a terrorism hotline after getting into a fight with him.
The FBI even followed it up and interviewed the woman, whose name is not mentioned in the report, thrice.
Despite the tip off, Headley managed to roam free and travel to Pakistan and Dubai in 2006. The report has also raised the question as to why the Indian intelligence agencies were not tipped off about the possible LeT plot.
Headley, who has confessed to all the terror charges slapped against him, conducted the recce of the locations that were targeted in the 26/11 carnage that killed nearly 200 people and injured over 300.