Liverpool have warned fans they will ban anyone who lets off smoke bombs and other "pyrotechnic devices" at matches.
This season there have been frequent episodes of canisters being opened at away games, sending plumes of red smoke into the stadiums.
It is not a trend purely limited to Liverpool fans but the Merseyside club have called for their supporters to cease or risk the prospect of exclusion.
"As the Reds prepare to take on Newcastle on Saturday the club is reminding its travelling fans that smoke bombs, flares and other pyrotechnic devices are not allowed in any Premier League football grounds," said a statement on liverpoolfc.com.
"A number of incidents have been reported recently that a minority of Liverpool fans have been behaving inappropriately during our away fixtures and using these illegal devices.
"If a person is identified behaving inappropriately at away grounds then the club will have no option but to ban the individuals concerned from future matches.
"LFC encourages all away fans to respect the values of the club and stop taking these flares and fireworks to matches."
More top news
A colony of bees has set up home in one of Manchester’s Trees of Hope, a poignant symbol following the anniversary of the Arena bombing.
A few thunderstorms developing from the south later, otherwise dry and very warm.
Liverpool were beaten by Real Madrid in the Champions League final which saw Mohamed Salah forced off with injury.