Maharashtra CM orders probe over major power outage in Mumbai due to grid failure, local train services hit; India COVID-19 tally crosses 7.1 million; over 66,500 cases and 816 deaths in 24 hours; Hathras victim’s kin appears before HC in Lucknow amid tight security, cops facing negligence charges also summoned; Air quality in Delhi-NCR turns hazardous due to stubble-burning, resumption of economic activities, AQI hits 550 in Greater Noida; and more