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People are silhouetted against the Instagram logo at Facebook headquarters in Menlo Park, Calif.
Facebook-owned Instagram was down for some users for around 45 minutes on Wednesday.
Users on Twitter complained about the service being down. CNBC also checked Instagram and the photo sharing app was unable to refresh the feed to show new pictures.
The hashtag “#instagramdown” began trending on Twitter just after 9 a.m. London time. Shortly after Instagram resumed normal service.
An Instagram spokesperson was not immediately available for comment when contacted by CNBC.