Plainfield police are investigating the theft of nearly four dozen computers from the high school.

The laptop computers were taken from different parts of the building on Park Avenue. Police say since last November, the thieves got into school on three separate occasions. During the most recent theft, police say the vandals smashed a window of a classroom door and took 28 Gateway laptops. According to police, the thieves possibly knew where the key was in order to unlock the computer cart.

Police say in November, 10 computers were taken from a school office. They say in January, two computers were taken out of a teacher?s room. Anyone with information on the thefts is asked to call Plainfield police at (908) 753-3131.