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Ian Watkins' former Lostprophets bandmates are making it clear that they had no knowledge of his "appalling behavior" prior to the Welsh rocker's arrest.  

The group released a statement over the weekend explaining that they were holding on to hope that there had been some kind of mistake until Watkins pleaded guilty to 13 sexual offenses last week, including two of attempting to rape a baby. 

The band says Watkins was a "difficult character" and admit that their personal relationships with him had deteriorated recently, but they never imagined him capable of something like that.  They say the news has left them "heartbroken, angry, and disgusted," adding that it's something that will haunt them for the rest of their lives. 

They also say their hearts go out to the victims of Ian's crimes and others like them, and urge any other victims to contact authorities.  They hope that Watkins will "truly take responsibility" for his actions.  He's scheduled to be sentenced on December 18th. 

Meanwhile, a spokesperson for British entertainment retailer HMV tells "NME" that the company won't be selling any music by the now-defunct Lostprophets in stores or online.  The band announced that they were officially splitting up earlier this year. 

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