Complete the following phrase:  In December 2020, eight graduation ceremonies scheduled for that month were disrupted following threats to carry out a firearms and explosives attack on students attending graduation ceremonies scheduled for 7 and 8 December. On 18 December, a 22-year old woman appeared in the Auckland District Court on charges of threatening harm to people or property. Court documents have described the threat as being of a "magnitude surpassing the
هجوما كرايستشيرش 2019."