Photo: Bellingcat

Video has surfaced purporting to show a missile strike that is widely believed to have brought down a Ukrainian airliner in Iran.

The video, posted to Twitter, shows a flash in the sky and explosion over the Parand subdivision of Tehran.

A few seconds after the flash, a loud bang is heard.

The video was posted by the group Bellingcat, an independent research group, which says geolocation confirms Parand as the site it was taken.

Unconfirmed images circulating on the internet also purport to show a missile shell casing in the debris of the crash.

Iran has denied that claim and also that it had any part in the crash of Ukrainian International Airlines flight PS752.

All 176 passengers on board were killed.

In another video, a fast-moving light can be seen through the trees as someone films from the ground. The light appears to be the burning plane, which plummets to the earth as a huge fireball illuminates the landscape.

Someone off-camera says in Farsi: “The plane has caught fire. ... In the name of God, the compassionate, the merciful. God, please help us. Call the fire department!”