New Delhi, Sept. 26 -- The National Investigation Agency (NIA) did not press for US national Mathew Aaron VanDyke and six Ukrainians remaining in India while keeping open its Unlawful Activities Prevention Act or UAPA probe against them , and agreed to the accused travelling back to their home countries after furnishing personal undertakings, and providing residential address and contact details. A Delhi court on Thursday allowed VanDyke and the six Ukrainians to travel to their respective countries for a month on condition that they will join the investigation through video-conferencing, whenever required by the NIA. VanDyke left for Washington on Friday evening and has booked a return flight for October 21 to India. The development has triggered a political controversy with the Congress questioning the circumstances leading to VanDyke's release. The federal anti-terror agency had alleged that VanDyke and the six others, for nearly three months, gave training in drone warfare, drone operations, assembly and jamming technology to the members of Myanmar-based ethnic armed groups, including the Chin National Front (CNF) and the Kachin Independence Army (KIA). It had also claimed that VanDyke and others received logistical support from the members of CNF and the mission was financed through funds arranged by a commander of a Myanmar-based rebel group. The special public prosecutor, Rahul Tyagi, who appeared for the agency, citing "instructions" (from the agency), told the court that the UAPA probe will take time to complete. Meanwhile, necessary undertakings may be taken from the accused persons along with their residential address, phone number and emails, the NIA prosecutor said. An NIA spokesperson did not respond to queries regarding the position it has taken and allegations by the Congress....