Twitter Inc shares fell almost 7 percent on Monday after the company said it was investigating unusual traffic that might be from state-sponsored hackers and, in what appeared to be an unrelated issue, a security firm said hackers used the platform to try to steal user data.
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 Nov. 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 behavior.