LONDON (AP) — China poses a daily threat to Britain’s security, the head of the country's domestic intelligence agency said Thursday, remarks that step up pressure on authorities to explain why the prosecution of two men charged with spying for Beijing collapsed just before they were due to stand trial.

The government, prosecutors and opposition politicians, who were in power until last year, have traded blame over the failed criminal case as the United Kingdom tries to balance between challenging and engaging with the Asian superpower.

“Do Chinese state actors present a U.K. national security threat? The answer is of course yes they do, every day,” MI5 Director-General Ken McCallum told reporters during a rare public appearance. He said his agency had intervened to stop a threat from Be

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