"We have been in touch with the club and the relevant authorities and there will be more conversations on Monday," a spokesman said on Sunday.
West Ham, playing only their second league game at the former Olympic Stadium, now known as the London Stadium, issued a statement saying they would ban for life anyone involved in the trouble.
They lost the match 4-2 after leading 2-0.
(Reporting by Steve Tongue; editing by Clare Lovell)
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