Security agencies are probing whether David Headley Coleman, nabbed by FBI last month for plotting a major terror attack in India at LeT's behest, visited Mumbai three times.
Sources said the agencies were trying to ascertain if Headley had travelled to Mumbai with Tahawwur Hussain Rana,
a Canadian citizen of Pakistani origin also arrested by the FBI, the latest being in March this year.
The agencies have summoned records of travels of the duo following inputs that suggested their travel to the western
metropolis of the country in an attempt to carry out a reconnaissance of vital installations.
According to sources, the duration of the duo's visits and their destinations will be ascertained in the probe.
On one of the occasions, they said, it is believed that both the men travelled on different passports.
49-year-old Headley was arrested last month at Chicago's O'Hare International Airport as he prepared to board a flight
to Philadelphia, intending to travel to Pakistan.