Israel's attorney general has banned a Jewish women's prayer group from holding a special service at a key Jerusalem holy site.

The group, Women of the Wall, calls for gender equality at the Western Wall, the holiest site where Jews can pray. The site is overseen by an ultra-Orthodox rabbi who enforces conservative customs, including separate male-female prayer.

The Women of the Wall group has tried to challenge those norms and was to hold an all-female "priestly blessing" next week. That prayer is typically done by men.

A Justice Ministry statement Thursday said the decision was made because the female "priestly blessing" is an unrecognized custom that has never been held at the Western Wall.

Women of the Wall says the group intends to try to hold the service anyway.