Vienna, Jan 25 : For the first time in 20 years, the Covid-19 pandemic resulted in a decline in the number of detected human trafficking victims as there were fewer opportunities for traffickers to operate and some trafficking forms were less likely to be detected, a UN report has revealed. The number of trafficking victims identified globally dropped by 11 per cent in 2020 from the previous year, driven by "fewer detections in low and medium-income countries", according to the report published by the Vienna-based UN Office on Drugs and Crime (UNODC). In addition to reducing opportunities for human traffickers to operate, the pandemic may have weakened law enforcement capacities to detect victims, it said. The report, based on data from 141 countries, also showed a drop in the number of cases of trafficking for sexual exploitation during the health crisis. The pandemic-induced restrictions may have pushed such crimes into "more concealed and less safe locations", it said. The number of persons convicted of human trafficking globally also fell by 27 per cent in 2020 compared to 2019, with sharper decreases registered in South Asia, Central America, the Caribbean and South America. UNODC Executive Director Ghada Waly said in a statement that the pandemic had "increased vulnerabilities to trafficking in persons, further undercutting capacities to rescue victims and bring criminals to justice". She called on the UN and the donor community to support national authorities, particularly those in developing countries, to respond to trafficking threats and to identify and protect victims. /IANS