Alex Partridge tweeted to say he was "delighted" to hear leads were being followed up on the missing medals but pleaded with the public to get in touch if they knew anything.
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An industry has grown up around the Fab Four's legacy that supports 2,335 jobs and has potential for further growth.
CCTV footage is said to show the moment a laptop containing explosives is handed to the suspected suicide bomber.
Two-year-old Sophie spent six days on life-support after battery acid burnt a hole in her lung, but has since made a full recovery.