Social networking app Tumblr has been removed from Apple’s online App Store after child pornography was found to be visible through the app.

The photo and video-sharing app was quietly removed from the App Store on November 16 after initially becoming unavailable for App Store customers who had parental control filters turned on.

The company has now published a statement acknowledging the issue with child pornography on its service.

“Every image uploaded to Tumblr is scanned against an industry database of known child sexual abuse material, and images that are detected never reach the platform,” a spokesman said.

“A routine audit discovered content on our platform that had not yet been included in the industry database. We immediately removed this content,” he added. Apple declined to comment.

The app is still available to download through Google’s app store, although it’s unclear if the same problem occurred in the Android version of the app.

Tumblr has attempted to remove adult content on its app following the removal from the App Store.

A number of Tumblr users who published adult illustrations on the service have had their Tumblr pages deleted over the last several days.