Mumbai, March 9 -- COMEX Copper futures were under stress today, extending losses well under $6 per pound and testing around three-week low amid heavy selling in global equities. Sentiments were very weak for Asian stocks on Middle-East worries. China's Shanghai Composite index shed 0.67%. Hong Kong's Hang Seng index lost 1.35%. Japan's Nikkei average tanked 5.20%. European stocks tumbled with the German DAX falling more than 1% to test 11-month low. The US equities moved sharply lower during trading on Friday, adding to the losses posted in the previous session. The Nasdaq lost 1.6%, the S&P 500 tanked 1.3% the Dow slumped 1%. While equities tanked, Crude oil futures soared near four-year high as Iran-US tensions escalated. COMEX Copper fu...