Telegram’s founder Pavel Durov has said a massive cyber attack on his messaging service originated from China.
On Wednesday, the firm confirmed it suffered a “powerful” Distributed Denial of Service attack which disrupted services for about an hour.
In a DDos attack, hackers overwhelm a target’s servers with junk requests.
It came as protestors in Hong Kong used Telegram to coordinate demonstrations over a plan to allow extradition to China.
In a post on Twitter, Telegram said the disruption affected users in the Americas and “other countries”.
Mr Durov later tweeted the IP addresses involved in the attack mostly came from China.