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Britain's security services are set to clash with parliament and the press over revelations that police secretly used a controversial law to identify journalists' sources, triggering a wider debate about media freedom in the digital age. Other cases have since emerged, although the full scale of the practice is unknown since police do not need to go through a court under the Regulation of Invest Powers Act (RIPA). In the case of The Sun, the phone records of political editor Tom Newton Dunn were accessed to find out which officers were behind allegations that Andrew Mitchell, the government's senior representative in parliament, swore at police. "It was a fairly simple process for them to identify which telephone numbers could be linked to police officers," said Dominic Ponsford from the Press Gazette trade magazine, which is running a "Save Our Sources" campaign.