Footage of a teenage girl dying on the street in Tehran

Footage of a teenage girl dying on the street in Tehran has helped to rally anti-government protesters inside Iran and around the world.

Neda, who is thought to have been no older than 16, bleeding to death.

A message posted with the original footage on YouTube alleges she was intentionally shot in the chest.

"I am a doctor, so I rushed to try to save her," the video's poster said.

"But the impact of the gunshot was so fierce that the bullet had blasted inside the victim's chest, and she died in less than two minutes.