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We know they used this access to take control of many highly-visible (including verified) accounts and Tweet on their behalf. We’re looking into what other malicious activity they may have conducted or information they may have accessed and will share more here as we have it.

Once we became aware of the incident, we immediately locked down the affected accounts and removed Tweets posted by the attackers.

We also limited functionality for a much larger group of accounts, like all verified accounts (even those with no evidence of being compromised), while we continue to fully investigate this.

This was disruptive, but it was an important step to reduce risk. Most functionality has been restored but we may take further actions and will update you if we do.

We have locked accounts that were compromised and will restore access to the original account owner only when we are certain we can do so securely.

Internally, we’ve taken significant steps to limit access to internal systems and tools while our investigation is ongoing. More updates to come as our investigation continues.

Here’s an update addressing questions we’ve heard around passwords and account access specifically:

We have no evidence that attackers accessed passwords. Currently, we don’t believe resetting your password is necessary.

Out of an abundance of caution, and as part of our incident response yesterday to protect people’s security, we took the step to lock any accounts that had attempted to change the account’s password during the past 30 days.

As part of the additional security measures we’ve taken, you may not have been able to reset your password. Other than the accounts that are still locked, people should be able to reset their password now.

If your account was locked, this does not necessarily mean we have evidence that the account was compromised or accessed. So far, we believe only a small subset of these locked accounts were compromised, but are still investigating and will inform those who were affected.

We're working to help people regain access to their accounts ASAP if they were proactively locked. This may take additional time since we’re taking extra steps to confirm that we’re granting access to the rightful owner.

We’ve been working around the clock and will continue to provide updates here.

We want to share some more specific updates coming out of the second day of our investigations.

Based on what we know right now, we believe approximately 130 accounts were targeted by the attackers in some way as part of the incident. For a small subset of these accounts, the attackers were able to gain control of the accounts and then send Tweets from those accounts.

We’re working with impacted account owners and will continue to do so over the next several days. We are continuing to assess whether non-public data related to these accounts was compromised, and will provide updates if we determine that occurred.

For all accounts, downloading Your Twitter Data is still disabled while we continue this investigation.

We have also been taking aggressive steps to secure our systems while our investigations are ongoing. We’re still in the process of assessing longer-term steps that we may take and will share more details as soon as we can.

Thank you for your continued patience and understanding while we investigate this incident. We’ll continue to provide updates when we have them.

As of now, we know that they accessed tools only available to our internal support teams to target 130 Twitter accounts. For 45 of those accounts, the attackers were able to initiate a password reset, login to the account, and send Tweets.

We are continuing our forensic review of all of the accounts to confirm all actions that may have been taken.

For up to eight of the Twitter accounts involved, the attackers took the additional step of downloading the account’s information through our “Your Twitter Data” tool. We are reaching out directly to any account owner where we know this to be true.

Our investigation and cooperation with law enforcement continues, and we remain committed to sharing any updates here. More to come via @TwitterSupport as our investigation continues.

We hope that our openness and transparency throughout this process, and the steps and work we will take to safeguard against other attacks in the future, will be the start of making this right.

There is a lot speculation about the identity of these 8 accounts. We will only disclose this to the impacted accounts, however to address some of the speculation: none of the eight were Verified accounts.

Our investigation continues, but we wanted to share more specifics about what the attackers did with the accounts they accessed. Following a complete review of all targeted accounts, here is more detail on what we know today:

We believe that for up to 36 of the 130 targeted accounts, the attackers accessed the DM inbox, including 1 elected official in the Netherlands. To date, we have no indication that any other former or current elected official had their DMs accessed.

We’re hearing confusion around how the 8 accounts we reported yesterday relate to the 36 we reported today. These numbers refer to different things.