Military aircraft patrol above Lake Huron, on the US-Canada border, as a Canadian coast guard icebreaker searches for debris
• What do we know about the four flying objects shot down by US?
It was a mild, sunny winter afternoon when Tara Shannon learned all the airspace above her community in south-eastern Ontario had been closed.
Soon after, she and her neighbours began receiving scattered reports of a high-flying mystery object had been spotted in the area.
