The shoot out looked real enough from the photos someone took of the events. From the two behind a car in the road being shot at, to the elder brother being run over by the younger brother, who passes in between two police cars. There were a few pictures of bomb disposal robots blowing up suspected explosives too. I'll see if I can find them.
Regardless of the theories, loads of people were killed and these two were acting incredibly guilty for two supposedly innocent people. Why steal a car if you're innocent? Why shoot at the police chasing you? Very guilty actions for "harmless", innocent individuals.