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Another translation by Artax, THA:
Jost wrote, the police had advised the musicians, to gather evidence against the stalkers. Therefore, Bill, Tom and members of the Kaulitz family had started a few weeks ago to film the stalkers and take pictures of them. The stalkers had reacted aggressively also to that. "Among other things, they slapped the mobile phone camera out of the hand of a family member."
(...)

The chart-stormers had been aware from the beginning that their career would mean the loss of their privacy, Jost wrote to the DPA. They would not complain about this, and were well aware of many advantages. "However, it becomes problematic for the boys when their families are harassed, threatened and attacked."

Source THA