LOOKBACK: The deadly school shooting that launched California's ban on assault weapons

What: 5 children killed in school shooting

When: 1989

Where: Cleveland Elementary School in Stockton, Calif.

As the nation debates how to stop school gun massacres, we look back at the mass shooting that ushered in the modern era of gun control in California. It happened in 1989, before the unimaginable became routine.

RELATED: Bay Area students hold moment of silence on Columbine anniversary

Click here for more stories and videos related to school shootings.