Investigations are on into violation of Chennai airspace by an unidentified helicopter, airport sources said Tuesday.
The helicopter was spotted Monday by Air Traffic Controller (ATC) on the radar but despite his efforts, it did not establish contact, the sources said.
The copter hovered around the region for more than two hours and went upto Kalpakkam, where an atomic power plant is located, before leaving the Chennai airspace, they said. In a smilar incident, an unidentified aircraft was spotted near Rameswaram coast a fortnight ago. Bureau Report