This is the 17430th most frequent Russian word.
террористическую
"Terrorist" (adjective), related to terrorism.
In this sentence, 'террористическую' functions as an adjective describing the type of attack that was intended, indicating its nature as related to terrorism.
Полиция предотвратила террористическую атаку в центре города.
The police prevented a terrorist attack in the city center.
Here, 'террористическую' is part of the phrase describing the nature of the threat as being associated with terror acts.
Пресса сообщила о террористической угрозе в аэропорту.
The press reported about a terrorist threat at the airport.
The term 'террористическую' identifies the type of activities that are being discussed, specifically those associated with terrorism.