White House officials are investigating emails affiliated with a previously unreported email account used by Jared Kushner and Ivanka Trump, both of whom are White House advisers, just after launching an investigation into private email use among White House staff.

White House email addresses have sent hundreds of emails since January to accounts on the Kushner family domain, according to Politico and the Project on Government Oversight. A significant chunk of the emails were sent not to individual personal accounts, but to an account both Kushner and Ivanka Trump used along with their personal household staff for family scheduling.

This third account, which was set up in December, is concerning and calls into question the breadth of personal email use from Ivanka Trump and Kushner, according to the report.

The content of the emails includes non-public travel documents, internal schedules, and some official White House materials. This content was primarily sent from Ivanka Trump, her assistant, and others who work with Ivanka Trump and Kushner in the White House. Most of the emails received from the account were from the White House, but some exceptions for other private accounts apply.

It has not been disclosed what privacy measures have been implemented to secure the domain but Politico reported some security precautions were established upon installment.

The White House launched an internal investigation of private email use after news broke that members of President Trump's family had been using private email accounts.

The probe was launched after it was revealed Ivanka Trump, Kushner, and several other senior White House officials, were found to have used private email accounts to conduct work-related business.

Kushner sent or received approximately 100 work-related emails from his personal account during the first seven months of the year.

Former White House officials were also found to have used private accounts, including former chief White House strategist Steve Bannon and former chief of staff Reince Priebus.