According to officials, Mohammad Motalem alias Majnu, a suspected Bangladeshi operative of LeT, was arrested from the capital's Motijheel area.
Deputy Commissioner of Police, Monirul Islam said, "We arrested Mohammad Motalem, alias Majnu, in line with the confessional statement of the three Pakistani LeT operatives."
44-year-old suspected terrorist was remanded to custody for four days under an order from Dhaka Metropolitan Magistrate Court for interrogation.
"We suspect him to be a mastermind of a plot to carryout an attack on the Indian High Commission and US embassy in Dhaka," he said.
"He confessed that he participated in the Afghan resistance against the Soviet forces in late 1980s," the police chief added.