ORLANDO – The father of Omar Mateen, the man identified as the killer in the Orlando nightclub massacre, said he is “extremely” upset over the incident and has no idea why his son “committed such an act during the Muslim holy month of Ramadan.”

“I do not know what caused this. I did not know he had hatred in his heart,” Seddique Mateen said.

Seddique Mateen, who lives in Florida, is a self-proclaimed revolutionary president of Afghanistan.

He had been addressing the Afghan people through video messages on his Facebook account.

He appointed a “cabinet” for his revolutionary government and has been issuing “orders” and “policy” related statements via his Facebook page.

“The revolutionary people of Afghanistan, each one of you has the ability to arrest Ashraf [Afghan President Ashraf Ghani], Atmar [Mohammad Hanif Atmar, Afghan national security adviser], Khalilzad [Zalmay Khalilzad, former U.S. ambassador to Kabul]… and rid Afghanistan of their evil acts,” Mateen, dressed in Afghan army garb, said in a Facebook message a few hours before his son killed at least 50 people at the Orlando nightclub.

In his video messages, Mateen has been critical of the Afghan government under President Ashraf Ghani. He says his government will help Afghans get rid of the war and corruption and will guarantee a “prosperous” Afghanistan.  

Mateen told NBC News that his son’s act had nothing to do with religion. He added that his son was “enraged” when he saw two men kissing a couple of months ago in Miami.

“I think he just wanted to boast of himself,” the elder Mateen told The Post late Sunday in an interview from his home in Port St. Lucie, Fla. “No radicalism, no. He doesn’t have a beard even. . . . I don’t think religion or Islam had anything to do with this.”

Mateen said his son stopped by the day before the rampage and showed no apparent warning signs.

“He was well behaved. His appearance was perfect,” he said. “I didn’t see any sign of worrying or being upset or nervous.”

He heavily condemned his son’s actions.

“I don’t miss anything about him,” the elder Mateen said. “What he did was against humanity.”