Many newspaper subscribers all over the country were without copies of their papers on Saturday after a cyberattack causes some major problems with printing and delivery of several newspapers including the Los Angeles Times, the Chicago Tribune, the Baltimore Sun as well as the San Diego Union-Tribune.

According to the Los Angeles Times, the cyberattack came from outside the United States and also affected the distribution of the West Coast editions of the Wall Street Journal and the New York Times, which are printed at the Los Angeles Times facilities. Problems included a shut down of software systems that store news stories, photographs and administrative information. As a result, it was difficult to create the plates used to print the papers in the downtown plant.

Publications within Tribune Publishing, the former parent company of the Los Angeles Times and the San Diego Union-Tribune were affected by the attack. No further details were given about the origin of the attack.

Tribune Publishing released a statement saying that “the personal data of our subscribers, online users, and advertising clients has not been compromised. We apologize for any inconvenience and thank our readers and advertising partners for their patience as we investigate the situation. News and all of our regular features are available online.”

Issues with distribution and printing were first detected on Friday and the Los Angeles Times’ technology have made progress in fixing it. Saturday editions of the Los Angeles Times were delivered late. Regular distribution is expected to resume on Sunday.