That was because their messengers were coming to them with clear proofs, but they disbelieved, so Allah seized them. Indeed, He is Powerful and severe in punishment.
The Saheeh International Quran Translation
ذَٰلِكَ بِأَنَّهُمْ كَانَت تَّأْتِيهِمْ رُسُلُهُم بِٱلْبَيِّنَٰتِ فَكَفَرُوا۟ فَأَخَذَهُمُ ٱللَّهُ إِنَّهُۥ قَوِىٌّ شَدِيدُ ٱلْعِقَابِThat was because their messengers were coming to them with clear proofs, but they disbelieved, so Allah seized them. Indeed, He is Powerful and severe in punishment.