Three police forces have been criticised by the police watchdog for "poor" handling of discrimination complaints.
The West Midlands, Greater Manchester and West Yorkshire forces were accused of "significant" failings in the way they dealt with allegations of discrimination, in an Independent Police Complaints Commission (IPCC) report.
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Explosives experts were called to the nuclear reprocessing site in Cumbria, to help deal with chemical substances.
The arrests were made on suspicion of producing and disseminating pedophilia content on the internet, the country's Justice Ministry said.
The A4-sized sketch originally went for £75 when it was first sold.