Telegram's official app has been removed from Apple's App Store.
It had been removed because it had made "inappropriate content" available to users, founder Pavel Durov said.
"Once we have protections in place we expect the apps to be back on the App Store," he tweeted.
The removal came soon after Telegram launched an unfinished version of its "experimental" Telegram X app. Apple took down both the official messaging app and the one still being worked on, the BBC reports on Thursday.
On technology news site TechCrunch, Natasha Lomas speculated the new app could have fallen foul of Apple guidelines requiring all apps to have filtering and blocking systems as well as ways for offensive content to be removed quickly.
Telegram has been criticised by some governments for using end-to-end encryption that protects communication between users.
Some law enforcement agencies have complained this data-scrambling technique can make it hard to investigate some complex cases.
