. ▁Green wald ▁described ▁Mir anda ' s ▁det ention ▁as ▁" clear ly ▁intended ▁to ▁send ▁a ▁message ▁of ▁int im id ation ▁to ▁those ▁of ▁us ▁who ▁have ▁been ▁reporting ▁on ▁the ▁NS A ▁and ▁G CH Q ". ▁The ▁Metropolitan ▁Police ▁and ▁Home ▁Secretary ▁Ther esa ▁May ▁called ▁Mir anda ' s ▁det ention ▁" leg ally ▁and ▁proced ur ally ▁sound ". ▁However , ▁Lord ▁Fal con er ▁of ▁Thor ot on , ▁who ▁helped ▁introduce ▁the ▁bill ▁in ▁the ▁House ▁of ▁L ords , ▁said ▁that ▁under ▁the ▁act , ▁police ▁can ▁only ▁det ain ▁someone ▁" to ▁assess ▁whether ▁they ▁are ▁involved ▁in ▁the ▁commission , ▁prepar ation ▁or ▁inst ig ation ▁of ▁terror ism ." ▁He ▁said , ▁" I ▁am ▁very ▁clear ▁that ▁this ▁does ▁not ▁apply , ▁either ▁on ▁its ▁terms ▁or ▁in ▁its ▁spirit , ▁to ▁Mr ▁Mir anda ." ▁Antonio ▁Patri ota ▁the ▁Brazil ian ▁Minister ▁of ▁External ▁Rel ations ▁said ▁that ▁Mir anda ' s ▁det ention ▁was ▁" not ▁just ifiable ". ▁The ▁reasons ▁for ▁Mir anda ' s ▁det ention ▁were ▁sought ▁from ▁the ▁police ▁by ▁British ▁polit icians ▁and ▁David ▁Anderson ▁Q . C ., ▁the ▁Independent ▁Rev iewer ▁of ▁T error ism ▁Legisl ation . ▁The ▁United ▁States ▁government ▁later ▁said ▁that ▁British ▁officials ▁had ▁given ▁them ▁a ▁" head s ▁up " ▁about ▁Mir anda ' s ▁det ention , ▁while ▁adding ▁that ▁the ▁decision ▁to ▁det ain ▁him ▁had ▁been ▁a ▁British ▁one . ▁