WASHINGTON — News Corp, publisher of The Wall Street Journal, said Friday that it had been hacked and had data stolen from journalists and other employees, and a cybersecurity firm investigating the intrusion said Chinese intelligence-gathering was believed behind the operation.

The news company, whose publications and businesses include the New York Post and WSJ parent Dow Jones, said it discovered the breach on Jan. 20.

It said in a regulatory filing that an investigation is underway “to determine its nature, scope, duration and impacts.”

It said customer and financial data were so far not affected and that the company’s operations had not been interrupted.

But a major concern was the company’s journalists.