Biden under pressure to refreeze $6bn in Iranian oil money after Hamas attack

Five Democrats join Republicans in calls to renege on agreement unless it is proved country wasn't involved in assault

Joe Biden is under pressure from fellow Democrats to refreeze $6bn of Iranian oil revenues released last month as part of a prisoner exchange deal amid accusations that Iran played a key role in last weekend's deadly attack on Israel by the Palestinian group Hamas.

Five Democratic senators up for re-election next year have joined Republican calls for the US president to effectively renege on the agreement that led to the release of five Americans held captive by Iran unless it is proved that the country's theocratic regime was not involved in Saturday's assault, which killed more than 1,000 Israelis.