Manchester United manager David Moyes has called on fans of both clubs to behave ahead of Sunday's encounter with old rivals Liverpool.
The mother of murdered toddler James Bulger has been targeted by a troll on Twitter.
A man from Manchester will be questioned over a barrage of 'hostile tweets' to a campaigner, including threats to rape and kill her.
Liverpool have apologised for any offence caused by a message posted on their official Twitter account which appeared to mock the Munich air disaster.
The club had asked on Twitter for suggestions of a three-song playlist to go out over the speaker system at Anfield just prior to kick-off in Sunday's Barclays Premier League match there between the Merseysiders and bitter rivals Manchester United.
One response read: "Come fly with me - Frank Sinatra. Always look on the bright side of life - Eric Idle. I like to move it - Reel to Real" - three songs associated with making fun of the 1958 tragedy in Munich which claimed the lives of 23 people, including eight United players.
Liverpool replied with: "Have you been sneaking a look at the dressing room iPod?"
An apology was subsequently issued, with a club spokesperson saying: "Liverpool Football Club responded quickly to correct the error of judgement that was made last night on its official Twitter account in responding to a distasteful and inappropriate Tweet.
"The club took decisive action and the comment was deleted swiftly.
"We apologise, unreservedly, for any offence that was caused by this mistake."
A man will be questioned today over a barrage of hostile tweets to a feminist campaigner, including threats to rape and kill her.
Caroline Criado Perez faced a deluge of threats on Twitter over the course of more than a day after she successfully campaigned for a woman's picture to be put on a new bank note.
Scotland Yard said a 21-year-old was arrested yesterday in Manchester on suspicion of harassment offences after officers in Camden, London, received a complaint of malicious communications on Thursday.
After a man was arrested in connection with abusive tweets sent to feminist campaigner Caroline Criado Perez, she tweeted:
Just at the police station now about to make a formal statement. There are many more threats to report. #shoutingback
Luis Suarez has released a statement via Facebook and Twitter accepting the 10-match ban for biting Branislav Ivanovic.
"I acknowledge that my actions were not acceptable on the football pitch so I do not want to give the wrong impression to people by making an appeal,"
– Detective Chief Inspector Chris Bridge, of GMP’s Public Protection Division
Maintaining the anonymity of victims of sex offences is absolutely vital and is something that really helps encourage them to come forward.
Breaching this ruling is an extremely serious offence and that is why we launched an investigation as soon as we became aware.
Social media is an immensely powerful tool that does an awful lot of good, but it can also be used to spread rumour, speculation and in this case break the law.
As a force GMP embraces the use of social media but when it is abused in this way we will take robust action to hold those responsible to account.
A man has been arrested in connection with a tweet that claimed to know the identity of a rape victim.
A tweet containing personal opinion about who the author thought was a victim of sex offences, including rape was sent on Wednesday February 27 2013.
By law, victims of all sexual offences are afforded anonymity for life.
A 23-year-old man was arrested on suspicion of publishing a name, address or photograph that would identify someone that should be anonymous.
– Spokesman for the Attorney General's Office
The AGO has been alerted to a possible contempt of court.
We are liaising with the MoJ and others to establish the facts.
We can neither confirm nor deny whether the pictures in question are of Jon Venables.
It should be noted, there is a worldwide injunction in place which prevents the publication of any images or information purporting to identify anyone as Jon Venables.