India, Jan. 21 -- Bitcoin fell back below the $90,000-mark, hitting its weakest level in over a week as a broad selloff swept through global markets and investors pulled back from riskier assets amid mounting geopolitical uncertainty.

The world's largest cryptocurrency dropped under $90,000 for the first time since January 9, mirroring losses across equities, long-term US Treasuries and Japanese government bonds as turbulence spread through debt markets, Bloomberg reported. After sliding as much as 4% on Tuesday, Bitcoin extended its decline into Wednesday's Asian trading hours, last trading down 0.5% at 88,894 dollars as of 9:27 am in Singapore.

Market participants said the 90,000 dollars level has been a key technical threshold in rec...