The police statement said five of the six adults – four men and two women – had identification tags on them. Two showed signs of having had post-mortem examinations.
The discovery was “deeply troubling”, police commissioner Allister Guevarro said.
“Any individual or institution found to have violated that duty will be held fully accountable,” the commissioner said.
A state of emergency which gives police extended powers of search and arrest has been renewed since being introduced on 2 March.
The US state department has issued several travel advisories since then – due to crime as well as “a heightened risk of terrorism”.
“Although violent crime in Trinidad and Tobago has dropped greatly since 2024 due to security efforts started during the previous state of emergencies, crime remains a challenge throughout the country,” the advisory said.