An Arsenal supporters group has complained to the Spanish ambassador to the United Kingdom about the behaviour of Spanish police during the Gunners' 1-0 loss to Atletico Madrid in the UEFA Europa League semi-final second leg earlier this month.
A written statement from Lois Langton of the Arsenal Independent Supporters' Association was sent to the ambassador describing some officers in the Spanish capital as "violent uniformed thugs," per BBC Sport.
This article will be updated to provide more information on this story as it becomes available.
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