You are correct. News now reporting live ordnance to be detonated.
https://www.latimes.com/local/lanow/la-me-ln-freeway-closure-plane-crash-20190517-story.html
The Public Affairs Officer (COL) is one obfuscating individual in the video. He simply refuses to answer questions related to the ordnance. 18 hours have elapsed at this point and an enormous safety zone (prohibited entry) has been established, to include the closing down of I-15.