This is the 1482nd most frequent Portuguese word.
causado
Caused.
In this sentence, 'causado' is the past participle of the verb 'causar' (to cause), used in the passive voice structure to indicate the cause of the action (the accident being a result of negligence).
O acidente foi causado por negligência.
The accident was caused by negligence.
Here, 'causado' again functions as the past participle in a passive construction, connecting the subject ('O problema') to its cause ('um erro no sistema').
O problema foi causado por um erro no sistema.
The problem was caused by an error in the system.
'Causados' is used in its plural masculine form to agree with the plural masculine noun 'danos' (damages), maintaining subject agreement in the passive voice.