The latest news and top stories on Homeland Security Investigations (HSI), a prominent US federal law enforcement agency, serving as the principal investigative arm of the Department of Homeland Security. Headquartered in Washington DC, HSI operates across 235 US cities and maintains an international presence in over 50 countries. Its primary mission is to investigate, disrupt and dismantle transnational criminal organisations and threats that exploit US customs and immigration laws. HSI’s key activities include combating human trafficking, child exploitation, narcotics smuggling, cybercrime and financial fraud.