The Law Society says it's worried about a "very serious" security breach involving a member of the public gallery allegedly throwing a cellphone at a prosecutor's head during a bail hearing.
The Crown prosecutor was reportedly concussed and the cellphone broke on impact during the incident in Nelson on Monday.
"The freedom of lawyers to appear in court and to participate in our justice system without the fear that they will be assaulted or injured is extremely important," Law Society vice-president Mark Wilton said.
"We do not blame court security staff, who we know carry out an important and demanding job well. However, any serious incident such as this must be followed with a comprehensive reassessment of security levels and measures."
He said a security review was needed.