Several parents in an Iowa town where a deadly school shooting took place earlier this month told school officials on Monday they want more preventative measures and transparency as the school board plans for students’ return.

Their comments came during a Perry school board meeting, the day after the death of Principal Dan Marburger, who was critically injured in the shooting.

Grace Castro criticized the school district’s policies, saying that “lives were lost due to our lack of preventative measures.” She suggested the installation of metal detectors at schools’ entrances and a temporary remote learning option at the same time, and enforcement of a clear-bag policy as “the absolute least you can do.”

Her comments echoed what many other many other parents — including some of the victims’ families — have been saying on the Perry Facebook page since the district first announced its reopening plan last week.