https://tech.newstatesman.com/security/china-marriott-data-breach

An internal investigation has revealed that Chinese intelligence officials may have been behind the four-year-long cyber attack that compromised 500 million Marriott International customers’ data, according to Reuters.

The news agency reported that China is currently considered the most likely culprit, after the hacking tools used in the attack were deemed to resemble those previously linked to Chinese hackers.