India, April 23 -- Indian shares tumbled on Thursday to extend steep losses from the previous session, with rising crude oil prices amid stalled U.S.-Iran peace talks, and rupee weakness linked to the RBI's partial rollback of earlier curbs on derivative trades weighing on markets.

The dollar wobbled near a 1-1/2-week high and Brent crude prices extended gains for the fourth straight session to surge toward $104 a barrel, reigniting worries about inflation, interest rates and economic growth.

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