Related by context. Frequent words. (Click for all words.) 59 alert 49 lockdown 46 vigilant 46 remain vigilant 44 vigilance 44 precautionary measures 42 precaution 42 bomb sniffing dogs 42 patrols 41 imposed curfew 41 travel advisories 40 heightened 40 patrolling 40 precautionary measure 39 evacuations 39 untoward incident 39 precautions 38 standby 38 watchful 38 warnings 38 evacuated 38 lookout 38 Heightened 38 foiled plot 37 advisories 37 curfew 37 retaliatory attacks 37 contingency 36 blizzard warning 36 siege 36 warning 36 voluntary evacuation 36 quarantine 36 mandatory evacuation 36 tropical storm warning 36 massive manhunt 35 patrolled 35 precautionary 35 beefed 35 jittery 35 tenterhooks 35 evacuate 35 evacuation 34 terrorist attacks 34 cordoned off 34 arrests 34 threat 34 massing 34 layoff notices 34 Warnings 34 anonymous caller 33 cordon 33 mandatory evacuation order 33 undue reliance 33 tornado warnings 33 stationed 33 explosive device 33 preparedness 33 metal detectors 33 Evacuations 33 security 33 patrol 32 barricades 32 emergency preparedness 32 hiring freeze 32 radiological 32 attacks 32 clampdown 32 flight cancellations 32 terror 32 diplomatic missions 32 threats 32 manhunt 32 false alarm 32 cordons 32 Curfew 32 disruptions 32 barricaded 32 blockades 32 vigil 32 quarantines 32 provocations 32 subways 32 surveillance 31 false alarms 31 Independence Day 31 stay indoors 31 pickets 31 crackdown 31 disruption 31 reprisal attacks 31 Homeland Security Secretary 31 alerted 31 curfews 31 arrest 31 foiled 31 festive mood 31 preventive measures 31 Patrols 31 riot gear 31 sirens