Assad Hussain, aged 32, was found guilty of two offences of sexual activity with a child.
Mohammed Karrar, aged 38 was found guilty of 18 offences including rape of a child under 13 and facilitating child prostitution.
Bassam Karrar, aged 33 was found guilty of 9 offences including conspiracy to rape a child under 13.
Zeeshan Ahmed, aged 27 was found guilty of two offences of sexual activity with a child.
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Attorney General Loretta E. Lynch spoke at a press conference earlier following arrests made in Zurich.