Ow are groups relevant to understanding psychological and behavioural responses to disaster? Can social identity theory help?

My deadline is Monday at 4pm so please can I have this completed by 3pm.

John Drurys work is relevant to the question on groups and disaster
doi/10.1348/014466608X357893/pdf

and

Drury, J. & Winter, G. (2004). Social identity as a source of strength in mass emergencies and other crowd events. International Journal of Mental Health, 32, 77-93.
IJMH%20%28Drury%20&%20Winter%29.pdf