LONDON - British police summoned WikiLeaks founder Julian Assange to a London police station on Thursday as part of his extradition process, demanding he leave Ecuador's embassy where he has been holed up seeking political asylum.

Assange, 40, is wanted for questioning in Sweden over sex crime allegations and took refuge in Ecuador's London embassy in a surprise move last week.

He now risks being arrested the moment he steps outside the red-brick building after breaching bail terms, keeping both his supporters and police puzzled as to what he might do next.

On Thursday, police said it had formally "served a surrender notice upon a 40-year-old man that requires him to attend a police station at date and time of our choosing".

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