noun, noun or participle which takes 'suru', intransitive verb
simultaneous multiple occurrences; happening at the same time in multiple places
Often used for coordinated events such as terrorist attacks, accidents, or outbreaks that occur concurrently in different locations. Can function as a noun or as a suru-verb.
同時多発テロは世界中に衝撃を与えた。
The simultaneous terrorist attacks shocked the world.
各地
They are investigating the cause of the fires that broke out simultaneously in various places.