Authorities said the voter registration offices of Orange and Riverside counties were closed Friday after receiving a bomb threat.

Bomb threats prompted evacuations at voter registration offices in Orange and Riverside counties during ballot counting.

Election offices in Orange and Riverside counties were evacuated after each received bomb threats. No explosives were found in either building. Both threats were sent via email, authorities said. ABC News is reporting that these same types of threats have been happening at offices across the country.