Liverpool are to "establish the facts" following reports of "heavy-handed" treatment at the hands of police and stewards in Tuesday's Champions League clash at Sevilla.
Supporters group Spirit of Shankly claimed that some travelling fans were refused entry into the Ramon Sanchez Pizjuan Stadium, while others were assaulted by police.
A statement released by the group's chairman Jay McKenna to ESPN read: "We became aware of issues affecting supporters during the first half of the match.
"A couple of our committee members reported problems getting into the ground, being refused access as the flag they had [which featured a Liver bird and the word "defiance"] was accused of having a political message.
"What is more concerning is the reports of heavy-handed treatment of supporters, including physical assaults, with one committee member reporting she was punched as she was pushed out of the ground.
"Similar experiences have been shared with us from other supporters last night, and we've asked people to come forward so we can raise this issue with the club.
"We've already flagged it up to them and we're aware they are looking for more information.
"Clearly, though, what happened last night isn't acceptable and we will be asking both clubs and UEFA what they plan to do about it."
UEFA is reportedly aware of the problems fans had in accessing the stadium, and Liverpool are looking into the alleged incidents.
"Following detailed and troubling accounts given by Liverpool supporters attending the match against Sevilla last night, the club is seeking to establish the facts regarding their treatment at the hands of the host stewards and local police force," a club statement read.
"The safety and security of our supporters is our paramount concern and we intend to gather all the relevant information before responding further."
Liverpool drew the game 3-3 having seen a three-goal half-time lead wiped out by Sevilla.
24 de mayo 2018
|Lineker, Stoichkov, Zico - the stars who blazed a J-League trail for Iniesta|
|Golf not fame drives McIlroy|
23 de mayo 2018
|De Villiers tributes led by Du Plessis, Kallis and Tendulkar|
|Buttler ´maturity´ is just what England need, says Vaughan|
|Fit-again Wawrinka returns to winning ways|
|Toulouse take giant step towards Ligue 1 survival|
|Jets will not punish players for incurring anthem-related fines|
|F1 Raceweek: Hamilton and Bottas looking to build momentum - Monaco GP in numbers|
|Steelers´ Antonio Brown advises Le´Veon Bell to ´show up´|
|Stephens out in Nuremberg, Stosur wins Strasbourg final rematch|
|Clippers extend coach Rivers´ contract|
|Ancelotti ´thrilled´ by Serie A return with Napoli|
|Carlo´s Angels? Napoli boss poses for unusual photograph|
|Brady will attend Patriots mini-camp despite OTA absence - Kraft|
|World Cup hero, Champions League master - the best of Andres Iniesta|
|Heading to my new home - Iniesta drops massive Vissel Kobe hint|
|Neymar fitter than Brazil expected ahead of World Cup|
|Jardim, Jokanovic reject Chelsea speculation|
|Knight Riders rally dumps out Royals in IPL eliminator|
|Salah, Mane, Firmino trio could blow Madrid away, says Redknapp|
|Napoli appoint Ancelotti after Sarri departure|
|NFL stars must stand for national anthem if on field|
|Mascherano laments Romero injury blow|
|´Mr 360´ De Villiers retires after going full circle|
|Ronaldo already a Real Madrid legend like Di Stefano - Nacho|
|Pep or Pepe? The Spanish footsteps Emery could follow|
|Arizona, New Orleans land Super Bowls as NFL draft heads to Nashville|
|Sarri thanked by Napoli chief De Laurentiis amid Ancelotti reports|
|You never know! - Vettel and Hamilton joke about potential Ferrari link-up|
|It´s a silly question - Carrick insists Pogba has Man Utd future|
|Yates protects Giro lead as Viviani takes fourth stage win|
|Ozil one of Arsenal´s biggest talents - Emery|
|Fastest ODI hundred, 278 not out - De Villiers´ best knocks|
|Deschamps: Rabiot has made a huge mistake|
|Arsenal players can challenge for titles, Emery insists|
|Salah can seal Ballon d´Or with Champions League win - Riise|
|I want Real Madrid to lose Champions League final - Alba|
|Leverkusen sign goalkeeper Hradecky|
|Arsenal job a ´dream come true´ for Emery|
|De Villiers hailed as a ´colossus´ after quitting Proteas|
|Benitez expects Lascelles to stay amid reported Liverpool interest|
|Saha tells Martial: Stay and work for Manchester United future|
|Atletico Madrid defender Savic undergoes hip surgery|
|Bess to make Lord´s debut against Pakistan|
|Vissel Kobe announce news conference amid Iniesta speculation|
|Yan Dhanda leaves Liverpool for Swansea|
|Injured Chung out of French Open|
|I wish he´ll come to PSG - Motta wants Buffon reunion|
|Guardiola praises new Arsenal boss Emery|
|Defensive woes, travel sickness and Ozil´s role - Emery´s Arsenal to-do list|
|WATCH: Anthony Joshua serves up Stephen Curry assist|
|De Villiers announces international retirement|
|Salah not comparable to Ronaldo yet - Karius|
|Toure open to Manchester United switch & wants to play with Pogba|
|Rockets backed up fighting talk, says Harden|
|Europa League master, record return at PSG - Arsenal boss Emery in Opta numbers|
|Curry not taking the blame for defeated Warriors|
|Arsenal confirm Emery appointment|
|Bellamy confirms talks with Brisbane Broncos|
|Ref took Champions League final away from Roma - Under|
|Goals galore and sinking City - Liverpool´s road to the Champions League final|
|Benitez: Winning Champions League changed my life|
|Brewers extend Diamondbacks´ losing streak to six|
|Weidenfeller bids farewell in Schmelzer´s last game as Dortmund captain|
|Owen surprised by Zidane success|
|Rockets break Warriors´ 16-game home postseason win streak|
|Bennett keen to see out contract as Broncos target Bellamy|
|Copa Libertadores Review: Silva helps Cruzeiro into last 16|
|Chargers tight end Henry suffers torn ACL|
|WATCH: Harden dunks all over Green|