SINGAPORE (Reuters) - Shares in Singapore-Listed Noble group tumbled 20 percent early on Friday to their lowest level since 2002 after a surprise quarterly loss a day earlier.

Noble reported a quarterly loss of $129.3 million for January-March period, stoking worries the commodity trader was failing to recover from a crisis-wracked two years despite a deep restructuring.

Its shares were trading down 20 percent at S$0.70 as of 0109 GMT.

(Reporting by Miyoung Kim)