A US report uses open-source material to conclude that the country has 3,000 warheads, not 400 as previously estimated.

A recent report by Georgetown University analysing hundreds of hours of Chinese state television, newspapers and blogs says China’s nuclear arsenal may be many times larger than previously thought.

The report says China could have as many as 3,000 nuclear warheads, a significant increase from the previously estimated high of 400.

Al Jazeera spoke to Dr. Phillip A Karber, a Georgetown University professor and chief author of the report.