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 these channels has increased since extremists have been forced off other platforms in the wake of the Jan. 6 siege of the U.S. Capitol by pro-Trump rioters.

Telegram is a Dubai-based messaging service that does little moderation of its content and has a sizable international user base, particularly in eastern Europe and the Middle East.