Pakistan is expanding its nuclear weapons stockpile faster than any other country in the world and now it is suspected of constructing a reprocessing site for a new centrifuge within the Khan Research Laboratories (KRL) in Kahuta.
According to commercial satellite imagery, the construction of a new site, based in the town of Kahuta (30km east of Islamabad), provides fresh evidence of how Pakistan is seeking to boost its atomic arsenal.
An analysis was conducted by IHS Jane's Intelligence review using satellite images taken by Airbus Defence and Space on September 28, 2015 and then again on April 18, 2016.
The structure of the site also bears strong resemblance to facilities built by nuclear fuel company URENCO which also operates several nuclear plants in Europe, it said.
The area of interest is approximately 1.2 hectares and is located within the secure area of the KRL, in the southwestern part of the complex, it said.
Pakistan is currently seeking to join the 48-member Nuclear Suppliers Group that seeks to prevent nuclear proliferation by controlling the export of materials, equipment and technology that can be used to manufacture atomic weapons.
Pakistan had conducted its first nuclear tests in 1998 and is believed to have around 120 nuclear weapons, more than India, Israel and North Korea.
A 2015 report written by scholars at the Carnegie Endowment for International Peace and the Stimson Center had said that Pakistan could increase its stockpile by 20 warheads a year and have the world's third largest in a decade.