This is the 7670th most frequent Russian word.
задержание
Detention or arrest.
In this sentence, 'задержание' refers to the act of law enforcement capturing a suspect.
Задержание подозреваемого произошло в центре города.
The apprehension of the suspect took place in the city center.
Here, 'задержания' refers to the arrests of individuals during an event.
Протест был спокойным, но всё равно произошли задержания.
The protest was peaceful, but arrests still occurred.
In this context, 'задержания' signifies the delay of a transport event.