Twitter said in a blog that it discovered suspicious traffic to a customer-support forum while investigating a security bug that exposed data, including users' phone country codes and details on locked accounts. It said the bug was fixed November 16.
Twitter observed a large amount of traffic to the customer support site coming from individual Internet IP addresses in China and Saudi Arabia.
"While we cannot confirm intent or attribution for certain, it is possible that some of these IP addresses may have ties to state-sponsored actors," the blog said.
"We continue to err on the side of full transparency in this area and have updated law enforcement on our findings," it said.
A company spokesman declined to elaborate as Twitter shares posted their biggest drop in more than two months.
The Chinese government consistently denies any involvement in hacking or other forms of internet attacks and says that it is dedicated to cracking down on such behaviour.
Speaking in Beijing on Tuesday, Chinese Foreign Ministry spokeswoman Hua Chunying said China's position on internet security and attacks was consistent.
China hopes all sides can deal with this issue via talks and cooperation on the basis of mutual respect, she added.
Wedbush analyst Michael Pachter blamed the decline on concerns that news of a breach could hurt growth and user engagement.
"Clearly, a breach like this impairs user trust in the platform," he said.
Separately, security software maker Trend Micro said in a blog earlier on Monday that attackers sent out two tweets in October in a bid to steal data from previously infected machines.
The hackers hid instructions in tweeted memes that secretly ordered infected devices to send information, including usernames, screen images and other content, Trend Micro said.
The Twitter spokesman declined to comment on the Trend Micro report.
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