The word averiguaron is the preterite form of averiguar in the third person plural.
See the full averiguar conjugation

averiguar

Pero los soldados enseguida averiguaron que sus fusiles tenían grandes problemas.
But soldiers quickly discovered their rifles had major problems.
¿Qué si estos tipos averiguaron donde vives?
What if these guys figured out where you live?
Pero creo que debería saber algo que averiguaron mis detectives.
But I think you should know something that my detectives found out.
Creo que averiguaron que David y Pam se conocían.
I believe they did find that David and Pam were acquainted.
De alguna forma, los chicos averiguaron lo que hice y...
Somehow the guys found out what I'd done and...
¿Alguna vez averiguaron el por qué de las serpientes?
Did they ever figure out why the snakes?
¿Cómo averiguaron cuál era la casa de seguridad?
How did they found out where the safe house was?
Sí, nunca averiguaron quién lo hizo.
Yeah, they never figured out who did it.
George, ¿averiguaron quién compró la casa?
George, were you able to find out who purchased the house?
Llama a la policía a ver si averiguaron algo.
Maybe you could call the police and see if they've learned anything.
¿Ya averiguaron qué tipo de bomba es?
Find out what kind of bomb it is?
¿y no averiguaron si esos zapatos fueron los que la mataron?
You don't even check if they were the ones used?
Si les pasó esto, quizá averiguaron una forma de curarlo.
If this happened to them, they might have figured out a way to cure it.
Después, ellos averiguaron que no era nada de eso.
Later, they found out she was not.
Quizá los talibanes averiguaron que trabajaba para nosotros y le enterraron.
Taliban probably found out he was working for us and they buried him.
¿Cómo averiguaron lo de la cinta?
How did they find out about this tape?
Y después ellos averiguaron que ella está embara....
So, then they find out she's preg...
Algunos que lo averiguaron ya no existen.
Some of the people that found out aren't around anymore.
¿Cómo averiguaron lo del apartamento?
Then how did they find out about the apartment?
¿Qué averiguaron acerca del dispositivo?
What have you learned about the device?
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