Over 145,000 COVID-19 cases in the country, 6535 new cases in the last 24 hours; Delhi-UP (Ghaziabad) border sealed again after a spike in COVID-19 cases;  Massive fire engulfs slum in Delhi's Tughlakabad; Karan Johar on self-isolation after 2 household staff test COVID-19 positive; WHO stops trial of anti-malarial drug hydroxychloroquine for treatment of COVID-19; and more