The FBI announced the beginning of an investigation into another incident involving a UAV, which took place in Tucson, USA at about 22:30. A suspicious drone was in close proximity to a helicopter belonging to the US Customs and Border Protection (CBP). Law enforcement authorities put the device under surveillance in order to identify the owner of device, but without success. According to a statement made by Associated Press, the drone appears to have taken off from an unknown location five miles south of Tucson. Anyone with information about the incident can contact the authorities.