Emergency Medical Services Act Article 31

The municipality and county (city) competent authorities of health and fire-fighting shall assist the mass casualties in the neighboring regions.
中文原文 緊急醫療救護法第31條
直轄市、縣(市)衛生及消防等有關機關對發生於其鄰近地區之大量傷病患,應予支援。

English translation for reference only; the Chinese text prevails. Not legal advice.