The Pentagon is investigating whether ISIS kingpin Abu Bakr al-Baghdadi was poisoned during a lunchtime feast — causing him to fall seriously ill.

The ISIS leader and three commanders were eating in the small town of Be’aj, Iraq, when all four suffered “severe poisoning” and had to be “transferred to an unknown location under strict measures,” the Iraqi news agency WAA said.

The barbaric terror group, also known as ISIL and Daesh, has launched a full-scale investigation to find the culprits, according to WAA.

Pentagon spokesman and Navy Capt. Jeff Davis told The Post that he is “aware of the reports, but we have no information to corroborate [them].”

“Suffice it to say we always have great interest in the whereabouts and condition of the leader of ISIL,” Davis added when asked if the US military was looking into the matter.

Over recent years, Baghdadi has risen to the top of the extremist world, becoming the most feared jihadi leader since Osama bin Laden.

The US government has put a $7 million bounty on his head.

Since 2013, his network of savage killers has taken over large swaths of Syria and Iraq, ruling small towns and large cities with an iron-fist under ­Sharia law.

Baghdadi also has sent his military-trained soldiers to Western nations to carry out numerous deadly attacks, while encouraging lone wolves through social media to commit similar acts of bloodshed.

Scores of innocent people have been slaughtered in the attacks across Europe and America.

The radical cleric also allegedly participated in the rape and torture of Kayla Mueller, a 26-year-old Arizona resident, who was kidnapped in Syria while working as a humanitarian aid. She was killed last February in a Jordanian airstrike on ISIS.

In 2004, Baghdadi was captured in the city of Fallujah by American soldiers during the US invasion of Iraq.

After spending several years as a US prisoner at Camp Bucca in southern Iraq, Baghdadi was released and subsequently took the reins as leader of ISIS in 2010.

There have previously been unverified reports that Baghdadi was either wounded or killed by US-coalition airstrikes.

Meanwhile, Iraqi jets leveled a radio station used by the ISIS.

Broadcasting abruptly stopped on Sunday at the Al-Bayan radio station, NBC News reported.

The station was “one of the strongest” propaganda tools used by the terror group, a spokesman at Iraq’s Joint Operation Command told NBC.

“They used to broadcast Islamic anthems that encouraged people to join them,” the spokesman said.

The station encouraged listeners “to stand against the government and encouraged people to be terrorists under the name of jihad,” he added.