Twitter warned of "unusual activity" from China and Saudi Arabia due to an error in the form of certificates.
Error – detected 15 November and recorded the day after – it might seem strange phone user code numbers, or if their account has been suspended, the company said.
IP-address of the two countries sent a large number of queries using the form, Twitter said.
They might have a connection with the "state-sponsored actors», Twitter said.
Stressing that they can not confirm the "intention or attribution probably" Statement on Twitter said they had informed the authorities about the opening in the interests of "full transparency".
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Those who have been directly affected informed, Twitter said. No full telephone numbers were found, nor any other personal information.
the company's share price fell by almost 7% on Monday.
Error The news comes on the same day the US Senate published a report that reveals how Russia has used all the social media platforms to influence the elections in 2016.
With particular emphasis on the conservative orientation with posts on immigration, dew and gun rights, the country is trying to blow up a voice left African-American citizen by spreading false information about the electoral process.