Hackers working on behalf of the Chinese government reportedly breached the networks of Hewlett Packard Enterprise Co. and IBM, and then used their networks to hack into the computers of their clients. Sources cited by Reuters on Thursday said the hackers were working on behalf of China’s Ministry of State Security and were part of a campaign known as “Cloudhopper” that aimed to steal secrets from the companys' clients. The Cloudhopper attacks reportedly infiltrated IBM and HP “multiple times” in breaches that would last for “weeks and months.” A source told Reuters that IBM last investigated an attack this summer, and HP conducted a “large breach investigation” in 2017. HP declined to comment on the Cloudhopper attacks, and IBM said it had no indications that corporate data had been compromised. “We take responsible stewardship of client data very seriously, and have no evidence that sensitive IBM or client data has been compromised by this threat,” IBM said in a statement.