The hate-filled Texan who allegedly slaughtered 22 people at a Walmart in El Paso earlier this month was “surprised no one challenged him or shot him” during his rampage, according to a law enforcement report.

Patrick Crusius, 21, was wearing ear protection while using an AK-47 he said he bought from Romania to kill shoppers on Aug. 3 at an El Paso Walmart, where he “wanted to shoot as many Mexicans as possible,” according to a Texas Department of Public Safety report obtained by the Texas Tribune.

Crusius told cops he ordered the weapon online and picked it up at a gun dealer not far from his home in Allen. He also purchased 1,000 rounds of ammunition from Russia, according to the report.

Police in El Paso had previously said the assault weapon used in the massacre was obtained legally, but did not elaborate. Crusius identified the gun in an anti-immigrant manifesto posted hours prior to the shooting as a WASR-10, a semi-automatic version of a Romanian military AK-47.

El Paso police and Crusius’ attorney declined to comment on the report, according to the Texas Tribune.

Crusius also spoke to detectives about his manifesto, saying the mass shooting was a “response to the Hispanic invasion of Texas,” according to the DPS report. The discovery of his rambling writing led federal authorities to start probing the shooting as an act of domestic terrorism, the Tribune reports.

Crusius said he initially went into the Walmart and then returned to his car to finish his manifesto, which he then published. He re-entered the store intent on killing Hispanic shoppers, mowing down 22 people and wounding 25 others, the report states.

Eight of Crusius’ victims were Mexican nationals.

He was put on suicide watch on at least two occasions since his arrest and remains held without bond. Prosecutors have said they intend to seek the death penalty for the attack, one of the deadliest mass shootings in US history.

With Post wires