You are given a sentence in Italian. Your job is to translate the Italian sentence into Galician.
One example: Tra di esse, si annovera il piccolo sistema in arabo detto al-jebr.
Solution is here: Isto inclúe un sistema en árabe chamado al-jebra.
Explanation: The Italian sentence is correctly translated into Galician, because the meaning is preserved.

Now, solve this: Tre ragazzi — tre studenti — erano stati arrestati dalla polizia militare perché trovati senza documenti
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Tres rapaces, tres estudantes, foron detidos polo exercito porque non levaban papeis.