Islamabad, Oct. 23 : Concerned over Pakistan's nuclear activities, US officials have been keeping an eye on the Kahuta nuclear site since 2003 through its Police College Training College in Sihala, which is situated close to the site.

According to sources, the American base, which is situated on a vast piece of land, is surrounded with high rise walls from all sides, so much so, that no one even from the senior college management is allowed to enter the prohibited zone.

Officials said US authorities have also installed a large signboard prohibiting foreigners from entering the region.

"The Americans have also placed containers as makeshift facility inside the said compound within the college boundaries," The Nation quoted officials, as saying.

Senior Pak officials have been continuously raising questions over US' interference, however, their concerns have gone unnoticed, the report said.

They argue that even if this Americans training center was necessary, why such a sensitive area had been chosen, risking the secrecy and sensitivity of nuclear installations in the country. (ANI)