US Democratic presidential hopeful Hillary Clinton did not show up at her camp's headquarters to address her supporters, as her Republican counterpart Donald Trump snatched victory in several key states.

Instead, her campaign chairman, John Podesta addressed the thousands of exhausted Clinton fans who have been waiting for positive results.

"It's been a long night and it's been a long campaign but I can say, we can wait a little longer can't we. They're still counting votes and every vote should count. Several states are too close so we're not going to have any more to say tonight," he said early on Wednesday. 

"So listen, listen to me, everybody should head home. We'll have more to say tomorrow. I want you to know, I want every person in this hall to know, and I want every person across the country that supported Hillary to know, that your voices and your enthusiasm mean so much to her and to Tim and to all of us - we are so proud of you and we are so proud of her.

"She's done an amazing job and she is not done yet. So thank you for being with her. She has always been with you. I have to say this tonight - goodnight. We will be back we will have more to say. Let's get those votes counted and let's bring this home.

"Thank you so much for all that you have done, you are in all of our hearts, thank you."

Al Jazeera's James Bays, reporting from the Clinton headquarters said: "No concession speech coming from Hillary Clinton ... this place is being cleared down and it seems they're going to wait until every last vote is counted and that clearly takes a very long time before Hillary Clinton is going to speak to the nation. We assume, unless there is some sort of miracle for the Clinton campaign, that will be a concession. It's not coming now though."

Source: Al Jazeera News