Iran car explosion 'kills nuclear scientist' in Tehran

A university lecturer and nuclear scientist has been killed in a car explosion in north Tehran. He is the fourth nuclear scientist to be targeted in the country in two years.

Mostafa Ahmadi-Roshan, an academic who also worked at the Natanz uranium enrichment facility, and another unidentified person were killed in the attack.

The blast happened after a motorcyclist stuck an apparent bomb to the car.

James Reynolds reports.