Arsenal will work together with Valencia to identify fans that made monkey gestures and Nazi salutes during Thursday’s Europa League semi-final at the Emirates.
Supporters in the away end could be seen making the obscene actions during the Gunners’ 3-1 win.
UEFA have been made aware of the incident, filmed by a fan and posted on social media, and are expected to open an investigation.
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Six Valencia supporters were ejected from the stadium on Thursday night, although it is not known whether this was in connection with making racist gestures.