The National Counterintelligence and Security Center warned Thursday that foreign hackers are increasingly targeting vendors and suppliers that work with the government to compromise their products in an effort to steal intellectual property and carry out espionage. The NCSC said it is working with other agencies, including the Cybersecurity and Infrastructure Security Agency, to raise awareness of the supply chain issue.

April marks what the government is describing as the fourth annual National Supply Chain Integrity Month. This year’s event comes as federal officials deal with the aftermath of the SolarWinds intrusion, in which hackers compromised the software supply chain through malware. At least nine federal agencies were hacked, along with dozens of private-sector companies.