ATLANTA: Polling stations closed Tuesday after a day of in-person voting in Georgia's closely watched US Senate elections that will determine which party controls the chamber and how Congress could impact Joe Biden's incoming administration.

The runoffs for two Senate seats follow the November 3 election that saw Democrat Biden narrowly win Georgia and defeat President Donald Trump in their bitter White House race.

After polls closed at 7:00 pm (0000 GMT Wednesday) in the southern state, US news outlets reported the races were too close to call, with Georgia officials saying results may not be known until Wednesday or later.