Update 3.34pm: Liverpool boss Jurgen Klopp has called on the club's fans to refrain from damaging the Roma team bus before tomorrow night's Champions League semi-final first leg at Anfield.
The build-up to the Reds' home quarter-final earlier this month was soured by an attack on Manchester City's team bus by Liverpool supporters.
Klopp said: "In the stadium do it again, outside the stadium please show the respect we have to show.
"This is such a fantasy club, an outstanding football family, known for a fantastic atmosphere all over the world so we don't need to throw whatever at the bus of the opponent team.
"If we can do what we did creating an atmosphere in front of the stadium then do it but show our opponents the respect they deserve.
"We can show how wonderful Liverpool people are and we can show it in 20 minutes before the game and then the whole world knows it."
Meanwhile, Liverpool skipper Jordan Henderson is confident PFA Player of the Year Mohamed Salah will remain at the club long term.
"He is a fantastic player, up there with the world's best, and there will be other clubs who want to take him away," the England international said.
"But we have a great set of lads, a great team and a great manager moving in the right direction and I am sure Mo will want to be part of that."
Earlier: Police vow to crack down on any throwing of projectiles at Roma team bus
Merseyside Police have vowed to crack down on any fan disturbances around Liverpool's Champions League semi-final against Roma, following the ugly scenes which marred Manchester City arrival at Anfield in the previous round.
City's coach was badly damaged by objects thrown by supporters in the street when the sides met earlier this month - actions which led to a UEFA charge and strong condemnation from Reds boss Jurgen Klopp.
Local police are on alert for any untoward behaviour ahead of tomorrow's last-four clash, promising a "firm, fair and friendly" approach which they hope will keep football in the headlines.
Chief superintendent Dave Charnock said: "We are expecting a vibrant atmosphere at Tuesday's match, but our intention is that at the end of the day we will be talking about the game and what happened on the pitch as opposed to off the pitch.
"As always, my officers will be dealing with the fans, as they would expect to be treated themselves.
"Our policing style will be firm, fair and friendly, but we will take action where necessary, against those individuals who may seek to cause problems or misbehave and spoil the evening for the majority of supporters.
"We know that this will be a busy operation and we hope that fans attending the match will act as ambassadors for their clubs and enjoy what I am sure will be a good game.
"Both sets of supporters will be delighted that their teams have reached the semis and that is an achievement worth celebrating for both clubs."
Liverpool City Council has provided mobile CCTV to assist the effort, while specially trained dogs will be on hand to detect pyrotechnics such as fireworks and flares.
Charnock added: "While recognising that some supporters feel they can add to the atmosphere of the occasion, the use of flares and other pyrotechnics at and around football matches is a concern.
"We fully support the club in working to eradicate this dangerous and reckless practice and would ask that supporters work with us.
"The police and courts take these offences very seriously and prosecution can result in a prison sentence. I would remind people that this can apply not only within the stadium, but also in the surrounding streets and when attempting to enter the ground.
"Merseyside Police is committed to ensuring that everyone involved and attending the game has a safe and enjoyable experience and we will not tolerate any criminal, or anti-social behaviour."