Oil rises back toward $100 and stocks tumble after a new wave of tanker attacks shakes markets

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• Oil was hovering near $100 on Thursday after Iran stepped up attacks on tankers.
• The latest tensions have overshadowed the IEA's historic release of oil reserves.
• Stocks dropped on Thursday as oil's new spike exacerbated inflation fears.

Oil briefly broke past the $100-per-barrel mark on Thursday, sending stocks tumbling as traders fretted over the economic impacts of the Iran war.

Brent crude surged to nearly $102...