The Calgary Board of Education is apologizing for disclosing the private information of 500 junior high school students.

A recent email from the principal of Georges P. Vanier School to parents came with an attachment containing confidential information.

The document detailed names, email addresses, phone numbers, Alberta Education identification numbers, grade placement, homeroom teacher, and primary language spoken at home.

In a statement emailed to CBC News on Wednesday, the public school board says the privacy breach was inadvertent and it has notified Alberta's privacy commissioner, who has opened an investigation.

The CBE says it takes such issues seriously and promises a similar breach won't happen again.