The 82-year-old man arrested on suspicion of sexual offences by officers from Operation Yewtree was interviewed under caution on November 29 last year, five days after a search warrant was executed at an address in Berkshire.
He has been bailed to a date in May pending further inquiries.
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Loudspeakers at the border have been switched off as a gesture of goodwill ahead of a meeting between the leaders of North and South Korea.
Liam Colgan vanished on February 10 while celebrating his brother’s stag-do in the German city.
Salah Abdeslam and an accomplice were handed the maximum sentence permissible over the incident in March 2016.