More than 50 US intelligence analysts have complained that senior military officials altered reports so as to downplay the strength of Takfiris in Syria, the Daily Beast reported Thursday.

More than 50 US intelligence analysts have complained that senior military officials altered reports so as to downplay the strength of Takfiris in Syria, the Daily Beast reported Thursday.

The online news outlet said senior officials at US Central Command changed the reports to bring them into line with the White House's rosier public view that the United States was winning the war against the militant groups.

"The cancer was within the senior level of the intelligence command," the report quoted a defense official as saying.

It said the revolt by intelligence analysts came to a head when two senior analysts at Centcom signed and sent a written complaint to the Defense Department inspector general in July alleging that reports, including some presented in briefings to President Barack Obama, portrayed the groups as weaker than the analysts believed they were.

Another 50 analysts supported the complaint, the Daily Beast said, citing 11 unnamed individuals knowledgeable about the details of the report.  

"The fact that so many people complained suggests there are deep-rooted, systemic problems in how the US military command charged with the war against the Takfiri ISIL group assesses intelligence," the Daily Beast said.

Under a directive by the Office of the Director of National Intelligence, which oversees the 17 US intelligence agencies, analytical assessments "must not be distorted" by a particular audience, agenda or policy view.

If the assessments were indeed skewed, it could help explain why public perceptions of progress against the insurgents has varied.