Right-wing extremists are using channels on the encrypted communication app Telegram to call for violence against government officials on Jan. 20, the day President-elect Joe Biden is inaugurated, with some extremists sharing knowledge of how to make, conceal and use homemade guns and bombs.

The messages are being posted in Telegram chatrooms where white supremacist content has been freely shared for months, but chatter on the channels has increased since extremists have been forced off other platforms in the wake of the siege of the U.S. Capitol last week by pro-Trump rioters.

In the days since the Capitol attack, for example, an Army field manual and exhortations to "shoot politicians" and "encourage armed struggle" have been posted in a Telegram channel that uses "fascist" in its name.

Far-right Telegram chat room membership has ballooned in recent days, particularly since the popular platform Parler, financed by the wealthy conservative backer Rebekah Mercer, went offline Monday after Amazon rescinded its web-hosting service.

There are multiple Telegram channels for the right-wing group called the Proud Boys, and the largest of them have more than 28,000 members. One channel frequented by Proud Boys has been renamed to attract ex-Parler users.

https://www.nbcnews.com/politics/congress/extremists-move-secret-line-channels-plan-inauguration-day-d-c-n1253876

So, it can be US who will ban Telegram :-)