evidence: The US military has shot down a third flying object over North American airspace in three days, as the air force general overseeing the airspace said he would not rule out any explanation for the objects yet. The high-altitude unidentified object, described as an "octagonal structure" with strings attached to it, was shot down over Lake Huron in Michigan on Sunday. [...] The US and Canadian military are attempting to recover the other objects that were shot down last week. Searches via sea and land are operating amid severe weather conditions.