Crude oil futures tumble after Shanghai locks down city for testing

Crude oil futures tumbled in mid-morning Asian trade March 28 after the Shanghai government locked down half the city for mass testing as COVID-19 cases there hit a record high. At 11 am Singapore time (0300 GMT), the ICE May Brent futures contract was down $2.79/b (2.31%) from the previous close at $117.86/b, while the NYMEX May light sweet crude…