An earthquake hit Norwalk around 1:51 am with a magnitude of 3.3. According to the USGS, the epicenter was two miles from Artesia, two miles from Bellflower, and two miles from Cerritos.

For more info, please read the original article by LA Times:
https://www.latimes.com/local/lanow/la-me-earthquakesa-earthquake-33-quake-strikes-near-norwalk-calif-khkf-story.html