Around 3:00 a.m. on Wednesday, a bright object, initially appearing to be a meteorite, lit up the skies over Mexico’s capital, stretching plains, volcanoes and small towns.

This is the moment firefighters unexpectedly turned up at a backyard waterslide party and blasted the slide with a powerful jet of water from the truck’s hose. Tiffany Maillet, 34, was at a ...