Mumbai and Delhi on Thursday once again saw a massive spike in Covid-19 surge, driven by Omicron variant. The same alarming trend has been reported in eight States, 14 cities and districts, prompting the Centre to write to affected States to take immediate measures. While Delhi and Mumbai have shown the maximum spike, other cities, including Gurugram, Chennai, Kolkata, Bengaluru and Ahmedabad too have reported sharp surge taking the total caseload on Thursday to 13,154 fresh Covid cases and 268 deaths in a span of 24 hours.