A Department of Homeland Security (DHS) intelligence bulletin has warned of a 'tiered' bounty system circulating among Mexican criminal organisations and allied gangs that targets US immigration officers in and around Chicago, with offers reaching $50,000 for killing senior personnel.
The alert coincides with aggressive interior enforcement under 'Operation Midway Blitz', which DHS says has produced more than 1,500 arrests across the region since early September.
