The Angels were sent to destroy the People of the Prophet Lut

Allah the Exalted said about Ibrahim, peace be upon him,

فَلَمَّا ذَهَبَ عَنْ إِبْرَهِيمَ الرَّوْعُ وَجَآءَتْهُ الْبُشْرَى يُجَـدِلُنَا فِى قَوْمِ لُوطٍ - إِنَّ إِبْرَهِيمَ لَحَلِيمٌ أَوَّاهٌ مُّنِيبٌ - يإِبْرَهِيمُ أَعْرِضْ عَنْ هَـذَآ إِنَّهُ قَدْ جَآءَ أَمْرُ رَبِّكَ وَإِنَّهُمْ آتِيهِمْ عَذَابٌ غَيْرُ مَرْدُودٍ

Small pebbles of baked clay would be sent down upon them: مُّسَوَّمَةً عِندَ رَ‌بِّكَ "marked, with your Lord, for the transgressors."... 51:34), that is, pebbles conspicuously marked by Allah. Some scholars say that each stone bore the name of the person with which he was to be destroyed, and if he ran in any particular direction, he was pursued by the same stone. Other verses say that these people were destroyed by Jibra'il's (علیہ السلام) turning their territory upside down. The two descriptions of the punishment are not mutually contradictory: Probably, the stoning incident took place first, and then the earth was turned upside down.