Quoting a government source, the Daily Mail reported that Cameron would not withdraw his suggestion that Pakistan was "exporting terror".
The source also insisted that Cameron "meant it".
"No, he said it and he meant it," the source is quoted as saying.
On Jul 28, while on his maiden visit to India, Cameron had warned Pak against exporting terrorism triggering off a war of words between diplomats in Islamabad and in London.
"We want to see a strong, stable and democratic Pakistan, but we cannot tolerate in any sense export of terrorism, whether to India, Afghanistan or anywhere in the world," he had said.