Sirens, Helicopter Respond to Accident, I-5 at Glendale Blvd. in Atwater Village

LAFD reports traffic accident with possible fatality, 10:54pm, southbound I-5 at Glendale Blvd. in Atwater Village. "Major traffic blocking all lanes, 4 patients total, 2 kids (6-year-old girl with burns), CPR on one of the patients." Rescue vehicles and helicopters converge after 11:00pm. Southbound I-5 issued SigAlert, lane closures north of Fletcher Drive, 11:29pm. Glendale Blvd. on-ramp also closed. Blow by blow from SigAlert.com:

• Green BMW Possible in #2 Lane 10:32 PM
• Reporting Party Called to Advise His Vehicle Was Blocking Lanes and to Ascertain If Assistance Was En Route 10:51 PM
  
• Party Was Holding for Spanish Translator; Sound Like Vehicle May Have Been Hit, Line Went Dead 10:53 PM
• Vehicle Has now Been Hit 10:54 PM
• Message Delivered LA Fire Department 10:54 PM
  
• CHP Unit on Scene 11:00 PM
• Possible Fatality 11:02 PM
• All Lanes Closed for now 11:03 PM
• CHP Unit on Scene 11:04 PM
• CHP Unit on Scene 11:22 PM
• CHP Unit on Scene 11:23 PM
• Glendale On Ramp Will Be Closed for Unknown Duration 11:26 PM
• Sigalert for All Lanes with Traffic Only Getting Thru in #1 Lane for Unknown Duration 11:26 PM
• #1, 2 Lanes Open 12:21 AM
  

UPDATE 12:12am: LAFD offers news on the 4 patients: 40-year-old female in cardiac arrest, 35-year-old male in serious condition with possible head injury and burns, 6-year-old female with leg burns. All transported to hospitals. 22-year-old male, minor injuries, not transported.