cleveland cleveland police friday tighten security plan republican national convention deadly shoot police officer dallas increase surveillance intelligence operations 10 days convention police departments across country require officer patrol pair rather alone follow ambush dallas deadly day police unite state since sept. 11 2001 attack new york washington cleveland attack raise another potential threat july 18-21 convention donald trump expect receive republican nomination president police officer labor union rank-and-file cop outside experts already question cleveland preparedness convention city police federal supervision use force ten days event cleveland still train police officer duty convention expect draw 50,000 visitors well clamorous protest crown contentious presidential candidate memory rather security team reinforce country large police departments hop city cobble together 3,000 officer mostly state agencies use borrow rent equipment convention award cleveland 2014 folks think .... yes generalize worry say matthew barge court-appointed monitor u.s. justice department oversight cleveland police ed tomba city deputy police chief head convention security previously tell reuters confident city convention plan reiterate confidence telephone interview friday response dallas attack get make change without doubt tomba say mention surveillance potential threats street level farther away plenty people watch different locations beef intelligence component go active tomba say police throughout unite state order officer work pair follow shoot dallas include new york chicago st. louis new york officer double assignments auxiliary police officer unarm except night stick use field next days police commissioner william bratton tell news conference st. louis police also require wear ballistic vest leave station enforcement activities chief sam dotson say twitter tomba say spend part friday morning reassure out-of-town police departments officer loan cleveland safe convention tell email pull plan without them cleveland police union president steve loomis among vocal critics complain front-line officer would undertrained poorly equip set guy failure loomis say dallas attack civic leaders say cleveland experience renaissance follow decades decline reputation line convention two separate incidents fatal police shoot recent years bring unwelcome national attention city 2012 13 cleveland officer fire 137 shots car unarm african-american man female passenger kill u.s. justice department investigate impose special federal oversight know consent decree remain force 2014 four months republicans choose cleveland convention white police officer shoot dead 12-year-old tamir rice black case become national focal point protest movement black live matter recent report federal monitor oversee cleveland consent decree portray police department physical infrastructure strain computers cars run-down deficient force police pay repair pocket use personal vehicles police work loomis union leader say half cleveland police officer yet receive convention train number probably close tomba say thursday upon get convention cleveland ask 200 police departments send officer include big cities generally best anti-terrorist school many big cities turn cleveland say unable spare officer tomba say cleveland exceed goal bring 3,000 reinforcements receive train home plus short course upon arrive tomba say dallas attack add cleveland concern republican convention