The COVID-19 pandemic has generally induced mass panic and threat across the world, including Nigeria, due to the perceived uncertainties, fears and insecurities in the communities. Based on this backdrop, this study examined COVID-19 pandemic and insecurity in Nigeria. Convenience accidental sampling was used to administer 1671 copies of a questionnaire on residents through an online/electronic survey. Data collected were analysed descriptively and inferentially. Findings revealed that the spike in crime during the COVID-19 lockdown period is relatively higher than usual with disruption of public peace, theft and rape accounting for the most prominent crime. Meanwhile, most respondents experienced crime incidence between 6 pm and 12 midnight. Ironically, idleness, poor spatial arrangement/planning, poor governance and poverty were the major catalysts for the crime spike during the lockdown, while fear-of-fear (phobophobia) and declined socio-economic capacity were predominant effects of crime experienced. The Fisher's exact test results revealed a significant relationship between the surge in crime and COVID-19-restrictive measures. The study concludes that the insecurities during lockdown periods have caused both temporary and permanent physical and psychological havoc; hence, it recommends quick advancement of the built environment with smart security measures and social supports for the citizenry during the pandemic.