"Potential suspects" refers to individuals who are being considered as possibly involved in a crime or an event under investigation, but haven't been confirmed or proven guilty yet. Full definition
The Internet was quick to try and identify the company referenced in the tweet (Re / code drew up a handy list of potential suspects). (entrepreneur.com)
For example, interviewing potential suspects in order to read their body language and facial expressions. (elearningindustry.com)
A road block was quickly set up in order to interview potential suspects leaving the parking lot. (chartercases.com)