Feb. 10 (Asia Today) -- South Korea's military-police joint investigation task force has conducted search-and-seizure operations at the National Intelligence Service and the Army Intelligence Command as part of a widening probe into allegations that drones were sent into North Korea with possible involvement by intelligence officials.

The task force said it executed warrants at 18 locations, including intelligence agencies, as well as the homes and offices of civilian suspects. Investigators are examining whether intelligence personnel contacted the alleged main perpetrator and provided cash payments related to the drone activities.

The NIS has denied any institutional involvement, saying there was no government-level direction. However, critics argue that the scale and nature of the alleged operation make it difficult to believe it occurred without awareness within the intelligence community.

According to the task force, three active-duty officers - a major and a captain from the Army Intelligence Command and a captain from a separate military unit - have been booked on suspicion of violating the Aviation Safety Act and other charges. Three civilians accused of launching drones toward North Korea from border areas have also been additionally charged under the Criminal Act with general offenses against the state.