June 15 (Reuters) - The Washington Post is investigating

a cyberattack on email accounts of some of its journalists,

according to a source familiar with the matter and an internal

memo reviewed by Reuters.

The memo sent to Post employees by Executive Editor Matt

Murray said the intrusion was discovered on Thursday and the

newspaper immediately initiated an investigation.

All Post employees had their passwords reset on Friday as a

precaution, Murray said in the memo, adding that the intrusion

was not thought to have had any impact on any additional Post

systems or on customers.

The newspaper also forced a credential reset for all Post

employees on Friday night.

The Wall Street Journal, which first reported the breach,

said it was potentially the work of a foreign government.

The WSJ report added that staffers at the Washington Post

were told the intrusions compromised journalists' Microsoft ( MSFT )

accounts and could have granted the intruder access to

work emails.

The reporters whose emails were targeted included members of

the national security and economic policy teams, including some

who write about China, the report added.

In 2022, News Corp ( NWSA ), which publishes the WSJ, was

breached by digital intruders. The email accounts and data of an

unspecified number of journalists were compromised in that

incident.