(CNN) Dozens of businesses and institutions across the country received email threats Thursday afternoon, prompting evacuations and sweeps of buildings. Guy Dickinson tweeted this photo of police at 17th Street and K Street Northwest in Washington, DC on Thursday afternoon. At this time it's unclear if the threats -- which have been received in San Francisco, New York, Seattle, Miami, Washington, DC and other locations nationwide -- are connected. It's unclear whether everyone who received a threat on Thursday received the same email. The message was identical to an email warning posted on social media by the Cedar Rapids, Iowa Police Department and similar to descriptions of other threats posted on social media nationwide.

Source: CNN December 13, 2018 20:14 UTC