Two Marjory Stoneman Douglas students were arrested Tuesday for bringing knives to school and a third is being evaluated for making online threats.

Meanwhile, a school deputy has been suspended for sleeping on the job after being caught by a student on Monday evening, according to the Broward Sheriff’s Office.

The student notified a sergeant patrolling the school that Deputy Moises Carotti was asleep in his patrol car, said Veda Coleman-Wright, a spokeswoman for the sheriff’s office.

The sergeant knocked on Carotti’s window to wake him up, she said. Carotti was suspended with pay while an internal affairs investigation is launched.

Broward County Sheriff Scott Israel said he was disheartened to learn of the allegations against Carotti.

“That a deputy was sleeping is incredibly disappointing,” he said. “As you know, I can’t comment on an ongoing internal affairs investigation, but once the findings are in I will make the appropriate decisions regarding the way we are going to handle it and the level of discipline.”

The matter was handled swiftly and appropriately, he said. “I’m extremely proud of the way the sergeant handled it. He identified an issue and immediately sent the deputy home.”

Jordan Salter, 18, was arrested Tuesday morning after a disagreement in the cafeteria with another student who asked her friend a sexually offensive question. Salter poured her cereal on the boy’s head and pulled a two-inch black knife from her bra, according to a report from the Broward Sheriff’s Office.

Another student, Gavin Stricker, 17, came to the attention of school authorities Tuesday afternoon after it was reported he had brandished a knife on a bus Monday. He was called into the school’s office and a 9-inch knife was found in his backpack, according to a juvenile arrest report.

A sophomore was hospitalized for a mental-health evaluation after screenshots of his Snapchat social media account showing him posing with a gun in his waistband circulated around campus Tuesday morning. He had also posted an image of bullets on Snapchat. The photos were captioned with “catch me out here n—-” and one referenced a student named Josh, the sheriff’s office said.

The student told a detective that the firearm in the photo was a BB gun and the bullets belonged to his father, according to a sheriff’s office report.

The student faces a misdemeanor charge for disrupting school with the social media threat. The student was hospitalized under the Baker Act because of self-inflicted wounds on his left arm, the report said.

The same student used the name “NickCruz” as his gamer tag for the online game Fortnite, according to the report. After he successfully clears a mental-health evaluation, the student will be taken to juvenile hall, the sheriff’s office said.

The incidents come a day after Zachary Cruz, the 18-year-old brother of Stoneman Douglas, killer Nikolas Cruz, was arrested for trespassing.

Nikolas Cruz, 19, has admitted to taking an AR-15 to the Parkland school on Valentine’s Day and gunning down students and faculty. Seventeen died and another 17 were wounded.

Both brothers are now locked up at the Broward Main Jail. Nikolas Cruz faces the death penalty and Zachary Cruz is being held on $500,000 bond.

Stricker’s mother, Amanda Stricker said school authorities told her that her son admitted to carrying the knife “for protection.”

His sister was in one of the classrooms that got shot up during Cruz’s deadly rampage, Amanda Stricker said through tears.

“I think he was scared as the rest of us were,” she said. “We thought he was doing OK, and I think he wasn’t doing as well as we thought he was.”

Broward schools Superintendent Robert Runcie said Stoneman Douglas has been rocked to its core and every new development takes on “a whole different level of awareness.”

“When a school gets impacted by an event like this, it changes the school,” he said. “We’ll see what the impacts are over time. People are still affected. Kids are grieving and concerned. They have fears. We need to continue to be sensitive to that at the same time we try to function in as normal a sense as we can, recognizing this is not a normal state we’re in and extra vigilance is required. We’ll continue to do what we can to support the community.”

In light of Zachary Cruz’s unlawful entry onto school grounds, district staff are reviewing security protocols, Runcie said.

Security is beefed up during the school day, he said, but not after school is dismissed. The district may expand heightened security until 6 p.m., he said, so that students participating in after-school activities are protected.