A US Army vet who converted to Islam mulled a mass killing of Christians, Jews and police officers in “retribution” for the Christchurch mosque attack in New Zealand, says an indictment describing his failed “martyrdom.”

The indictment against Mark Steven Domingo, 26, unsealed Monday, alleges that he plotted to carry out a terrorist attack in revenge for the killing of 50 Muslims in Christchurch, New Zealand.

“There were mosque shootings in new Zealand," Domingo posted on March 14 in a private online group, according to the indictment reviewed by NBC News and AP. “[T]here must be retribution.”

“I feel like I should make a christians life miserable tomorrow for our fallen bros n sis in [N]ew Zealand...maybe a jews life...they shed our blood...no Muslim should have to experience this, a message needs to be sent,” Domingo added.

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His comments drew the attention of an FBI informant, who offered to help. The two discussed plans for six weeks, the indictment said. Asked if he had a plan for afterwards, Domingo allegedly replied, “Martyrdom, bro.”

"Martyrdom, bro," Domingo said, according to the indictment. https://t.co/MsY2zIDO42 — Seamus Hughes (@SeamusHughes) April 29, 2019

Domingo was arrested in Reseda, California on Friday, after he decided to attack a “white nationalist rally” in Huntington Beach on April 27. According to the indictment, he had purchased several hundred nails intended to be used as shrapnel inside an improvised explosive device (IED).

“Domingo said he specifically bought three-inch nails because they would be long enough to penetrate the human body and puncture internal organs,” says the affidavit of charges against him, according to the Los Angeles Times. The indictment also says he expressed allegiance to Islamic State (IS, formerly ISIS).

The former US Army infantryman, who had been deployed to Afghanistan for four months, ending in 2013, was charged with attempting to provide material support to terrorists.