The case is being investigated by the Mutual UFO Network (MUFON) after it was sent the footage and a witness report. The man was in Lincoln, New Hampshire, in the US, when he recorded the odd video It appears to show a plane being followed and caught up by a smaller object. In a report to US-based MUFON, which is the world's largest organisation dedicated to UFO and alien research, the unnamed man said: "I am told that military pilots train in the mountains around where I live and I've always enjoyed seeing them fly through. "This happens all the time. Jets and helicopters are a common sighting. "So I naturally saw the jet and did a double take, because there was something following it." But, the witness thought the object looked strange, and was possibly something the military built, that was different to a plane or jet. He added: "I knew it wasn't a jet because it was actually right behind one. The jet it was chasing left a long contrail behind it, but the UFO did not. "The UFO was