▁as ▁air ports , ▁high ways ▁ ▁rail ▁transport , ▁hosp it als , ▁brid ges , ▁transport ▁hub s , ▁network ▁communic ations , ▁media , ▁the ▁electric ity ▁grid , ▁d ams , ▁power ▁plants , ▁se ap ort s , ▁oil ▁ref iner ies , ▁and ▁water ▁systems . ▁In frastr ucture ▁security ▁see ks ▁to ▁limit ▁vulner ability ▁of ▁these ▁structures ▁and ▁systems ▁to ▁sab ot age , ▁terror ism , ▁and ▁cont am ination . ▁ ▁Many ▁countries ▁have ▁established ▁government ▁ag encies ▁to ▁directly ▁manage ▁the ▁security ▁of ▁critical ▁infrastr ucture ▁usually ▁through ▁the ▁Ministry ▁of ▁Inter ior / Home ▁Affairs , ▁dedicated ▁security ▁ag encies ▁to ▁protect ▁facilities ▁such ▁as ▁United ▁States ▁Federal ▁Prote ct ive ▁Service , ▁and ▁also ▁dedicated ▁transport ▁police ▁such ▁as ▁the ▁British ▁Transport ▁Police . ▁There ▁are ▁also ▁commercial ▁transport ation ▁security ▁units ▁such ▁as ▁the ▁Am tra k ▁Police ▁in ▁the ▁United ▁States . ▁Crit ical ▁infrastr ucture ▁is ▁vital ▁for ▁the ▁essential ▁function ing ▁of ▁a ▁country . ▁Inc ident al ▁or ▁deliber ate ▁damage ▁can ▁have ▁a ▁serious ▁impact ▁on ▁the ▁economy ▁and ▁essential ▁services . ▁Some ▁of ▁the ▁thre ats ▁to ▁infrastr ucture ▁include : ▁▁ ▁T error ism : ▁person ▁or ▁groups ▁deliber ately ▁target ing ▁critical ▁infrastr ucture ▁for ▁political ▁gain . ▁In ▁the ▁November ▁ 2 0 0 8 ▁M umb ai ▁attacks , ▁the ▁M umb ai ▁central ▁station ▁and ▁hospital ▁were ▁deliber ately ▁target ed , ▁for ▁example . ▁ ▁Sab ot