Mandalay Bay security guard Jesus Campos mysteriously left the country just days after the Las Vegas massacre, a report says.

Customs and Border Patrol documents obtained by Fox News show that the 25-year-old entered the United States from Mexico at the San Ysidro border crossing in California — one week after the mass shooting.

It’s unclear how long Campos was out of the country. The documents only show that he re-entered the US.

The young man reportedly crossed the border at the same location in January.

While Campos was driving his own vehicle with Nevada plates during that trip, sources told Fox he took a rental car this time around — which was registered in California.

The new information raises even more questions about Stephen Paddock’s Oct. 1 massacre — such as why authorities would allow Campos to leave the country in the middle of their investigation or how the security guard managed to make it down to Mexico with a gunshot wound to his leg.

Campos reportedly took a bullet from gunman Stephen Paddock at the start of his killing spree.

The union that represents him told Fox they were aware of his trip to Mexico and claimed it was a pre-planned visit. What’s unclear, though, is why the group didn’t report his whereabouts in the days following the massacre.

ABC reportedly spoke to Campos on Oct. 4, but didn’t say whether he was out of the country.

State records obtained by Fox on Wednesday also showed that the 25-year-old is actually not registered as a security guard with Nevada’s Private Investigator’s Licensing Board.

The Clarke County Sheriff’s Office declined to comment when asked what license is required to be a security guard at a Las Vegas casino.

“Jesus Campos is a victim and we don’t speak about victims,” a sheriff’s spokesperson said.