Delta flight security incident leaves 3 injured

I'm not aware of any recent Delta flight security incident that left 3 injured. Can you please provide more information or a specific date or flight number so I can help you find the relevant information?

It's possible that you may be referring to a specific incident that occurred in the past, or maybe there was a misunderstanding or misinformation. If you can provide more context or details, I'll do my best to help you find the accurate information.

Additionally, you can also check the official website of Delta Air Lines or reputable news sources for any recent security incidents or updates.