Number 10: Adams arrest an independent police matter

Asked about claims Gerry Adams's arrest was politically motivated, David Cameron's official spokesman told a regular Westminster media briefing: "This is entirely - and rightly so - an independent police matter.

"The fact that there has been an ongoing investigation into this for a period of time is a well-known matter of public record."

The spokesman declined to say whether Downing Street had been given advance notice of the arrest by police.

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'Insufficient evidence' on Gerry Adams for prosecution

There is "insufficient evidence" to pursue a prosecution against Sinn Fein leader Gerry Adams in relation to the 1972 murder of Jean McConville, according to reports.