"Pakistani authorities had arrested as many as five other people in connection with the (Lashkar-e-Toiba) plot in recent weeks, including some former or current Pakistani military officials," the New York Times reported.
"Those arrested remain in custody, but it was unclear what role they played in the expanding plot," an officials was quoted by the paper as saying.
Headley and Tahawwur Hussain Rana who were arrested last month by FBI are accused of plotting terror attacks on behest of LeT against India.
"The arrests of Headley and Rana have widened into a global terrorism inquiry that has led to arrests in Pakistan and implicated a former Pakistani military officer as a co-conspirator," the paper quoted officials as saying.
According to American intelligence officials, some Pakistani military and intelligence officials even encourage terrorists to attack what they see as Pakistan's enemies, including targets in India, the report added.
However, a spokesman for the Pakistani Embassy in Washington, however, declined to comment on the arrests, citing the continuing inquiry.