The Associated Press is warning its reporters to stay vigilant after several received harassing messages from supporters of Democratic presidential candidate Bernie SandersBernard (Bernie) SandersKamala Harris: Trump administration ‘targeting’ California for political purposes Harry Reid says he won’t make 2020 endorsement until after Nevada caucus Gillibrand to appear on Fox News Monday night MORE.

Danny Spriggs, the AP's vice president for global security, said some reporters have received angry emails, social media messages and phone calls after the AP declared Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump pushes to speed up 5G rollout | Judge hits Roger Stone with full gag order | Google ends forced arbitration | Advertisers leave YouTube after report on pedophile ring 4 ways Hillary looms over the 2020 race Hillary Clinton met with Biden, Klobuchar to talk 2020: report MORE the presumptive Democratic presidential nominee.

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"We have not received any specific security threats," Spriggs said in an email to employees, according to Poynter. "It is always good to practice situational awareness around AP bureaus and offices." 

The AP on Monday declared Clinton the Democratic nominee, saying she had enough pledged delegates and superdelegate support to reach the party's threshold for the nomination. 

Their call angered Sanders supporters, who — along with Sanders himself — argue that superdelegates shouldn't be included in the delegate count because they don't officially vote until the Democratic National Convention in July. 

The AP defended its decision to call for race for Clinton, calling the process "painstaking but very straightforward." 

"By Monday evening, 571 superdelegates had told us unequivocally that they intend to vote for Clinton at the convention. Adding that number to the delegates awarded to Clinton in primary and caucus voting to date gave her the number needed to be the presumptive nominee," Executive Editor Kathleen Carroll said in a statement.

"That is news, and reporting the news is what we do."