In a video that surfaced on social media this week, a Manchester Memorial student slaps another in the face as other students look on.

MANCHESTER — Another video featuring student-on-student violence in Manchester schools has emerged on social media, this one showing a Memorial High School student slapping another across the face.

The victim, who is up against the wall, merely nods his head in apparent acceptance of the assault.

Two other students are shown in the four-second clip. One covers his mouth and snickers.

The video appeared on social media on Tuesday.

“It was messed up they did that to the poor kid,” said a Central High School student who contacted the Union Leader about the video. He asked not to be named for fear of retaliation.

Memorial and school district officials said they are aware of the incident and action has been taken. But they said it is a disciplinary matter and federal student privacy laws prevent them from addressing it in detail.

“We take all incidents seriously when it comes to anything now. There is not a situation that is not investigated seriously,” Memorial High School Principal Arthur Adamakos said.

The latest video surfaced about four weeks after a video emerged of an assault at Manchester High School Central in which a girl was being punched and pulled up a staircase by another girl, as a school official intervenes.

The Memorial High video shows a young man standing in what appears to be a hallway.

He is watching as another student winds up and delivers an open-handed slap across his face. A sharp slap is heard when the blow is struck. The victim keeps hold of a paper with his left hand, looks at the assailant and nods his head.

Assistant Superintendent of Schools Jennifer Gillis said the safety and security of students are officials’ highest priorities.

Adamakos said an assault on another student ranks second highest on a four-level scale of infractions in the student code of conduct. Ramifications can range from counseling to suspension.

He said students are allowed to have mobile phones in school, but several policies are in place, including a prohibition against taking photos or recording video when school is in session.

He would not directly answer a question about whether a student is disciplined if he strikes back when attacked. He said officials look at the circumstances.

“We want everyone to be safe in school. Our expectations are that no one strikes anyone,” Adamakos said.

He said school officials don’t share the results of a disciplinary action with other students or the community, but word usually does get out.