Convicted paedophile and former Lostprophets singer Ian Watkins may be attempting to release new music from jail.
The singer is alleged to have sent three tweets while serving 35 years in prison for child sex offences.
A Twitter account belonging to Watkins, who was jailed for 29 years in 2013, published three tweets linking to the music website, SoundCloud, yesterday.
One of the tweets said: "New! SEQUENCE INITIATED", and featured a link to a seven-second track that features a woman saying "L'Amour La Morgue" repeatedly.
The song has been published on a SoundCloud profile called "L'Amour La Morgue", which is thought to be a musical side project for Watkins.
He was previously the singer for Welsh rock band, Lostprophets.
The other two tweets showed further activity on the SoundCloud account, including promoting a track from another Soundcloud user MEGALELZ and another track uploaded onto the L'Amour La Morgue account six years ago.
Twitter users responded sourly to the new tweets with several people calling him 'sick' and a 'nonce'.
Calum Thomson said: "Crawl back under [your] rock #sicko" [sic].
Music producer Ben Bradley also responded to one of the tweets, saying: "Delete your account. Nobody wants to be reminded of who you are or what you've done. Delete it now."
However, some Twitter users presumed that his account had been hacked.
Nicole Brittan said: "anyone who thinks this is really Ian is DUMB AF! No one in jail has access 2 Internet #GULLIBLE#DUMBASSES".
The last time a tweet was posted from Watkins' Twitter account was on December 16, 2012, which said: "Well......that escalated pretty quickly......I do apologise...."
Three days later, Watkins was charged with conspiracy to engage in sexual activity with a female under 13 and possession/distribution of indecent images of children.
He later pleaded guilty in November 2013 to 13 child sex offences at Cardiff Crown Court.
Watkins was sentenced to 29 years in prison with a further six years on licence, but he will be eligible for parole after serving two thirds of the prison term.
Earlier this year, the Independent Police Complaints Commission (IPCC) said one detective sergeant and two detective constables at South Wales Police would face disciplinary proceedings after the force received complaints against Watkins in 2008, four years before he was arrested.
A spokesman said: "The IPCC investigator recommended that a detective sergeant has a case to answer for gross misconduct ... (after) the officer did not take sufficient action to progress inquiries.
"The IPCC investigator was also of the view that two detective constables have a case to answer for misconduct, as they did not undertake all reasonable and practicable lines of inquiry."
Watchdog officials added that they have also recommended a further case to answer for gross misconduct against the detective sergeant's 'lack of action' about reports that a 15-year-old girl was raped.
It is not clear if the Tweets have been sent by Watkins from prison, however, a prison service spokesperson said: "This offender has no access to a mobile phone."