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Shortly after midnight Tuesday, seven people were caught trespassing at the Quabbin Reservoir.

State Police say the five men and two women are from Pakistan, Saudi Arabia, and Singapore, and “cited their education and career interests” for being in the area. The men told police they were chemical engineers and recent college graduates.

The Quabbin, in Belchertown, is one of the country’s largest man-made public water supplies. Boston’s drinking water comes from the Quabbin and the Wachusett Reservoirs.