Everton have vowed to take "firm action" against any fan found guilty of throwing missiles at Liverpool players in Saturday's Merseyside derby.
Objects appeared to be thrown from the crowd at Andy Carroll, Craig Bellamy and Luis Suarez in the second half.
"This behaviour is totally unacceptable and will be rightly condemned by all right-thinking Evertonians," said director of communications Ian Ross.
Everton are working with police to examine video footage of the match.
The Football Association are waiting for referee Martin Atkinson's official match report before deciding on what action they will take.
Everton had midfielder Jack Rodwell controversially sent off - a decision they have appealed against - before Liverpool won the 216th Merseyside derby 2-0 with goals from Andy Carroll and Suarez.
Items including plastic bottles and what is thought to have been a coin were hurled onto the pitch during the closing minutes of the game.
Mr Ross added: "We are fully aware of the incidents which occurred during Saturday's derby game.
"We are currently working with Merseyside Police on collating and analysing all available CCTV footage of the incidents.
"If we can identify any supporter who threw anything - and we mean anything - on to the pitch on Saturday we will take immediate firm and far-reaching action."