The way the BBC broke the news of a police search of Sir Cliff Richard's house was "handled inappropriately", the head of an influential group of MPs said.
Chair of the Home Affairs select committee said "a deal was done" which meant the BBC had "an exclusive position" about a criminal matter.
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Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.
Investigators believe Mr Kushner has significant information relevant to their inquiry, officials told NBC News.
The men were detained as part of an investigation by MI5 and the Metropolitan Police's Counter Terrorism Command.