manila philippine immigration authorities free four east timor delegate hold 12 hours manila airport security clampdown ahead asean east asia summit next week four east timorese allow philippines authorities keep passports formal order issue clear entry say rhoda viajar media relations asean civil society conference/asean people forum immigration authorities say four hold upon arrival saturday morning could explain purpose travel able establish financial capacity visit civil society conference organizers understand stringent security measure implement due upcoming asean summit viajar say say remain concern possibility similar incidents upon arrival many participants countries since 2005 asean leaders hold dialogue region top civil society group listen development concern address critical issue poverty health education philippines security force deploy nearly 60,000 army police personnel nov. 10-14 asean east asia summit ensure safety 19 world leaders thousands delegate 10 southeast asian nations 10 dialogue partner include u.s. president donald trump monitor real direct threat national capital region complacent national police chief ronald dela rosa tell reporters review security preparations sunday could threats ready challenge police deploy 400 mobile patrol cars 200 motorcyles 22 armor vehicles 100 bomb-sniffing dog ensure security safety leaders officials delegate big regional summit manila year areas completely lock head state governments hold meet main roads run former u.s. air force base 90 kms north manila venues partly close interior undersecretary catalino cuy say plan jam mobile phone signal prevent potential crude bomb attack would cause inconvenience state officials security personnel philippines free four east timorese attend asean meet