There was a shootout before he entered the school? Did it happen before or after he crashed the truck?

Edit: shootout happened after he left truck but before entering school. There was one officer in the school who engaged and was shot by Ramos, but officer Estrada says that Ramos had a shootout with several officers.

There was a shootout before he entered the school? Did it happen before or after he crashed the truck? Is there a timeline I can look at?

Edit: shootout happened after he left truck but before entering school. There was one officer in the school who engaged and was shot by Ramos, but officer Estrada says that Ramos had a shootout with several officers.

There was a shootout before he entered the school? Did it happen before or after he crashed the truck? Is there a timeline I can look at?