The Royal Cayman Islands Police Service is investigating the theft of construction materials, including copper wire, from a storage area on the John Gray High School construction site.
Police officers responded Saturday afternoon when security guards noticed three men near the construction site storage area at the back of the building off Walkers Road in George Town.
The three men ran when the security guards approached and left the scene in a white car, police said.
No arrests have been made in the case.
The new high school, which began construction works in 2008, has not been completed due to numerous difficulties with cost overruns and project delays.
Ministry of Education officials said in November that government is going back to the drawing board on budgeting and planning for the school prior to any new construction work resuming.