Mumbai, Sept. 25 -- A surging oil market, historic highs in US yields, and a regulatory shake-up in domestic insurance combined to trigger a broad sell-off in equities on Thursday, with India faring among the worst in Asia. Brent crude oil crossed $106 a barrel and US treasury yields rose to their highest in nearly 20 years, while a proposed insurance overhaul cast a cloud over the distribution incomes of Indian banks. The Nifty and Sensex fell 1.6% and 1.7% respectively, hitting their lowest levels since April 6 and June 8.P12...