(Reuters) -A cyberattack on the Washington Post compromised the email accounts of several journalists and was most likely the work of a foreign government, the Wall Street Journal reported on Sunday.

The Wall Street Journal reports that on Sunday, an internal memo from executive editor Matt Murray notified employees about an attack on on its email system, possibly by a foreign government. It also cites unnamed sources saying that the Microsoft accounts targeted included reporters on the national security and economic policy beats including some who write about China.

Reporters covering national security and economic policy were among the employees affected by the breach.