A terror attack on Pakistan's nuclear reactors was of very remote probability as the controls and security measures around various installations and radiation facilities in the country were enough to deter and delay such a sabotage, said a report.

''The likelihood of a successful attack on nuclear reactors in Pakistan is low,'' said Mr Mohammad Saleem Zafar, a chief scientific officer with Pakistan Nuclear Regulatory Agency (PNRA) in his report released by the US-based Henry L Stimson Center.

He also said that any such attempt would be detected in early stages.

Mr Zafar, a recent visiting fellow at Stimson Center, said post 9/11, countries around the world were re-evaluating safety and security of their nuclear facilities against sabotage acts.

The advancement in the knowledge of science and technology and their accessibility to terrorists has made the threat of nuclear terrorism no longer a fiction but real due to the terrorists' intention to inflict catastrophic damages on man, environment, and property, he added.

''In the presence of multiple safety and physical barriers, the probability of nuclear terrorism on research reactors was very low. However, even after a successful sabotage act on a nuclear reactor, the extent of damage both to public and environment will depend on the mode of attack, quantity of radioactivity release, movement of radioactive material through environment and its uptake by the human body, weather conditions, time of attack, the efficiency of counter-measures put in place to protect people from radiation, and many other factors.''