Iranian TV has shown the first video footage of an advanced US drone aircraft that Tehran says it shot down near the Afghan border. The film was captioned "RQ170 - advanced US spy plane" and carried on the Vision of the Islamic Republic of Iran Network 1 channel.
Earlier this week US officials said they were "concerned" about the loss of the unmanned aircraft. The drone, known as a Sentinel, is the first such loss by the US.
bbc