Late on the night of the May 14, seven people–five men and two women–were caught trespassing at the Quabbin Reservoir.

Part of Boston’s drinking water comes from the Quabbin.

These seven individuals hail from Singapore, Saudi Arabia, and Pakistan. According to a Boston CBS affiliate, they told police “they were chemical engineers and recent college graduates–citing their education and career interests” as their justification for getting close to the reservoir.

State police said the individuals live “in Amherst, Cambridge, Sunderland, Northampton, and New York City.” They say the individuals had no warrants and that there was no indication of a crime greater than trespassing being committed.

All seven were released, but will be brought to court over the incident. The FBI is now involved in the investigation as well.