Pulled into the shop this morning and noticed most of the work trucks jacked up on blocks, with everyone standing around. Seems over the weekend someone took it upon themselves to slash eleven tires on a total of nine trucks. Only the trucks that are used on a daily basis had slashed tires, shop trucks and spare trucks not affected, this seemed odd. Myself and the other two service Techs and Gas Fitter drive our trucks home. A former employee was visited by the local police department, unsure if anything has been proved as of yet. We all know who did it, just will never be able to prove it.