▁area , ▁and ▁a ▁campus ▁alert ▁was ▁sent ▁via ▁email ▁to ▁everyone ▁affili ated ▁with ▁U BC ▁while ▁students ▁and ▁fac ult ies ▁were ▁to ▁remain ▁locked ▁in ▁the ▁building . ▁ ▁On ▁April ▁ 1 0 , ▁ 2 0 0 8 , ▁two ▁Canadian ▁secondary ▁schools ▁were ▁locked ▁down ▁due ▁to ▁sus pected ▁fire arm ▁thre ats . ▁George ▁S . ▁Henry ▁Academy ▁was ▁locked ▁down ▁in ▁Toronto , ▁Ontario ▁at ▁approximately ▁ 2 : 0 0   p . m . ▁The ▁Emer gency ▁Task ▁Force ▁( TP S ) ▁were ▁contact ed ▁and ▁the ▁lock down ▁last ed ▁for ▁more ▁than ▁two ▁hours . ▁New ▁West min ster ▁Second ary ▁School ▁was ▁locked ▁down ▁in ▁New ▁West min ster , ▁British ▁Columbia ▁at ▁approximately ▁ 1 : 4 0   p . m . ▁The ▁Emer gency ▁Response ▁Team ▁( ERT ) ▁were ▁called ▁and ▁the ▁school ▁was ▁under ▁lock down ▁until ▁ 4 : 3 0   p . m . ▁Due ▁to ▁the ▁size ▁of ▁the ▁school ▁some ▁students ▁were ▁not ▁able ▁to ▁leave ▁until ▁ 7 : 0 0   p . m . ▁ ▁On ▁ 1 9 ▁April ▁ 2 0 1 3 , ▁the ▁entire ▁city ▁of ▁Boston ▁was ▁locked ▁down ▁and ▁all ▁public ▁transport ation ▁stopped ▁during ▁the ▁man h unt ▁for ▁terror ist ▁D zh ok har ▁and ▁T amer lan ▁Ts arna ev , ▁the ▁suspect s ▁of ▁the ▁Boston ▁Mar athon ▁bomb ing , ▁while ▁the ▁town ▁of ▁Wat