Children playing games downloaded as apps are not always aware they are spending money, a Daybreak experiment found.
The four children taking part in the experiment were given a password they could use to buy extras. All of the children went on to use the password and spent money:
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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.