He was at the school yesterday to speak before watching a panel discussion on gender equity and sport.
The US Embassy in New Zealand confirmed the assault took place while the delegation was at the school but they were not involved in any way.
Pound told the Herald the assault occurred in a different part of the school to the US delegation visit.
She said a member of the New Zealand Police who was already on-site assisted in resolving the situation and provided support.
In the communication to parents, Pound described the assault as a “distressing incident” and said she wanted to make sure parents had the correct information about what happened.
She said no students were “physically harmed” and staff and students were being supported.
The student involved was not at the school today and the matter was being dealt with, Pound said in the email.
“All students have received this information this morning and encouraged that if they need support at any time, to ask their teacher to release them to the Student Support area to talk with a Dean or Counsellor,” the email said.
Pound said the school was working in conjunction with the Ministry of Education.
The US Embassy in New Zealand posted about the delegation’s visit on Twitter saying Emhoff was “honoured” to witness and be part of the panel discussion at Epsom Girls Grammar School.
“Their outstanding dedication towards academic excellence, sports leadership, and cultural enrichment for young women is commendable,” the post on the Embassy’s Twitter page said.
The school has been contacted for comment.
A police spokesperson confirmed on Friday afternoon that just before 3pm on Thursday police were called to Epsom Girls Grammar School following a student allegedly assaulting two staff members.
“Police investigations remain ongoing and the student has been referred to Youth Aid Services.”