evidence: The unidentified flying object shot down in Canadian airspace on Saturday appeared to be a "small, metallic balloon with a tethered payload below it," according to a Pentagon memo sent to lawmakers on Monday and obtained by CNN. [...] An unidentified object was shot down over northern Canada on Saturday, marking the third time in a week that US fighter jets have taken down objects. [...] The operation marks the third day in a row that an unidentified object was shot down over North American airspace. An unidentified object was shot down over northern Canada on Saturday. On Friday, an unidentified object was shot down in Alaska airspace by a US F-22.