This is the 9428th most frequent Spanish word.
alertaron
"They alerted."
In this sentence, 'alertaron' is the verb and indicates that the neighbors informed or notified the authorities about an issue.
Los vecinos alertaron a las autoridades sobre el incendio.
The neighbors alerted the authorities about the fire.
Here, 'alertaron' is used to denote that the news broadcasted or made people aware of information regarding climate change.
Las noticias alertaron sobre el cambio climático.
The news alerted about climate change.
In this example, 'alertaron' signifies that they warned or cautioned their friends regarding a potential or existing threat.