Messaging app Telegram has returned to the App Store after being temporarily yanked for "inappropriate content."

Telegram and the new Telegram X apps were removed from Apple's store yesterday, Telegram Founder and CEO Pavel Durov confirmed.

"We were alerted by Apple that inappropriate content was made available to our users and both apps were taken off the App Store," Durov wrote on Twitter. "Once we have protections in place we expect the apps to be back on the App Store."

Apple did not immediately respond to PCMag's request for comment. By 11 a.m. ET this morning, Durov tweeted that the apps had returned.

"Telegram is back in the AppStore after being absent there since midnight CET. Every day 500,000+ users download Telegram for Android and another ~100,000 download Telegram for iOS," he wrote.

The app vanished from the App Store around the same time the company launched Telegram X for Android, an experimental app that's "faster and more battery-efficient than the original." In the future, Telegram X "may or may not eventually replace the existing official app," Telegram wrote in a blog post yesterday.

As 9to5Mac reported yesterday, users on Reddit who first noticed the disappearance speculated it was related to the Telegram X Android announcement, but that doesn't appear to be the case.

There's no word as to what type of "inappropriate content" was circulating on Telegram that led to the removal, or what protections the company put in place, if any, to have the apps reinstated.

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Apple's App Store Review Guidelines state that apps should not include "objectionable content," including anything that is "offensive, insensitive, upsetting, intended to disgust, or in exceptionally poor taste." Apple goes on to list examples of such content, including: "defamatory, discriminatory, or mean-spirited" material; "realistic portrayals of people or animals being killed," "depictions that encourage illegal or reckless use of weapons;" "overtly sexual or pornographic" material; and "inflammatory religious commentary." Apple also bans apps that contain "false information and features," including prank calling apps.

Apps with user-generated content, like Telegram, must include a "method for filtering objectionable material from being posted," a "mechanism to report offensive content," a way to "block abusive users from the service," and "published contact information" so users can easily reach out with questions and concerns.

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