Senior US military officers have provided Washington with manipulated reports on the war against Daesh (ISIL) Takfiri terrorists in Iraq and Syria, officials say.

Intelligence analysts provided investigators with documents that indicate military officers presented a more positive picture of the war to the White House, Congress and intelligence agencies, The New York Times reported Tuesday, citing several government officials.

Bridget Serchak, a spokeswoman for the Pentagon’s inspector general, confirmed that the investigation is focused on United States Central Command (Centcom), which oversees the US military operations against Daesh in Iraq and Syria.

“The senior intelligence officers are flipping everything on its head,” The Times quoted an unnamed government intelligence analyst as saying.

According to the analyst, the complaints involve the highest-ranking officials in Centcom’s intelligence unit, run by Army Maj. Gen. Steven R. Grove.

The Times reported last month that investigators had launched an inquiry, but the scope of the investigation and the allegations were not clear.

“The investigation will address whether there was any falsification, distortion, delay, suppression or improper modification of intelligence information,” Serchak wrote to The Times in an email on Tuesday.

She said the investigation would examine any “personal accountability for any misconduct or failure to follow established processes.”

The allegations have angered members of Congress, who believe they may have been provided with a distorted picture about the military campaign’s progress.

“We do take seriously any allegations of the mishandling or manipulation of intelligence information for purposes other than getting to ground truth,” said Representative Adam Schiff of California on Tuesday.

“In the wake of the flawed intelligence prior to the Iraq war, we must make sure that all voices are appropriately considered and that assessments are never again politicized, he added.

The issue is expected to come up on Wednesday, when General Lloyd J. Austin III, commander of US Central Command, will testify before a Senate panel about the US war against the Daesh terrorist group.

Last summer, US President Barack Obama, authorized an open-ended bombing campaign against Daesh, which now controls large areas in Iraq and Syria.

Analysts accuse Washington and its allies of claiming to fight militant groups like Daesh, while in reality they helped create and train those organizations to wreak havoc in Muslim countries.