WELLINGTON, April 13 - Four year nine boys were suspended over the incident in February but have since returned to the school.

School rector Gerard Tully notified parents of the development on Thursday morning.

"As a result of the considerable distress experienced by two of our women staff members from an incident of sexual harassment in February, they have each decided that they are unable to continue employment at the college and have resigned," he said in a statement.

The boys allegedly inappropriately filmed the teachers in what Mr Tully described at the time as a "most distressing incident of sexual harassment".

Education Minister Hekia Parata sad she understood there was some legal action being taken.

"I would expect that the board of the school will be concerned and will be taking responsible measures."

Parata wouldn't comment further.

"It's a matter for the school and those teachers."

The incident was one of two that prompted an anti-rape culture rally by schoolgirls and women outside Parliament in Wellington.

Days before the St Patrick's College incident boys at Wellington College came under fire for sexist and degrading comments made on a closed Facebook page.

One post allegedly said "If you don't take advantage of a drunk girl, you're not a true Wc [Wellington College] boy" and another "F*** women".

Tully said St Patrick's College remained committed to developing respect within all students.

"In our particular environment specifically includes the appropriate and respectful treatment of women and girls," he said.