Video appears to show Ukrainian airliner being hit

Video sent to CNN appears to show a missile fired into the Tehran sky early Wednesday morning and striking an object in the sky. Around that time, a Ukranian airliner crashed shortly after takeoff. CNN cannot verify the authenticity of the video, but the buildings seen in it appears similar to ones that are in the Iranian capitol suburb of Parand. The Ukrainian plane crashed just north of the suburb.

The US increasingly believes that Iran mistakenly shot down a Ukrainian airliner on Tuesday, according to multiple US officials. The working theory is based on continuing analysis of data from satellites, radar and electronic data collected routinely by US military and intelligence.