This looks very similar to my last experience of an evening match at Selhurst. Held back in the stadium for ages after the match (and without the civilised drinking options that the Amex offers away fans), then aggressively kettled by mounted Met Police for an extended period before being...
Not sure if this has been posted yet. Argus latest on it.
http://www.theargus.co.uk/news/15693252.Mob_of_fans_set_off_flares_in_ploy_to_break_into_the_Amex_in__return_to_dark_days_/