London mayor Boris Johnson has rejected the call for an election pact between Conservatives and the UK Independence Party (UKIP), declaring that voters have "had enough" of pacts and coalitions.
He added: "What they [voters] want is to see parties standing up individually for what they believe in."
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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.