That type of multi unit housing has a firewall between the houses on both sides. It usually extends above the roof and is designed to resist fire for a period longer than a debris fed fire can burn. The appearances are that the units on both sides should be okay.
correct. the fire separation required is usually a 1-hour wall , maybe 2-hours. However, fire separation partitions cannot and are not designed for the blast forces shown here. However, the after pics seem to show that the barriers worked good at stopping a fire spread. The concussion from the blast seems immense. Wish these folks well.