That is because they opposed Allah and His Messenger (Muhammad SAW). And whosoever opposes Allah, then verily, Allah is Severe in punishment.
Hayo ni kwa sababu walimpinga Mwenyezi Mungu na Mtume wake. Na mwenye kumpinga Mwenyezi Mungu, basi hakika Mwenyezi Mungu ni Mkali wa kuadhibu.