A suspicious package discovered at the New Hampshire Democratic Party headquarters was found to be non-threatening, officials said.

"This afternoon, we alerted authorities immediately upon finding a suspicious package at the NHDP Headquarters," the party tweeted on Monday. "Several staff members were evacuated and one was treated merely as a precaution. We are cooperating fully with the authorities and are grateful for all they are doing to ensure our safety."

Concord, N.H. police Lt. Sean Ford confirmed to WMUR 9, a local news station, on Monday night that the department received a call about a suspicious package at the headquarters.

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The building was evacuated and locked down following the package's discovery, according to the tv station. The street in front of the headquarters building was also briefly closed on Monday night, the Concord Monitor reported.

The party said on Tuesday that the suspicious package was determined to be non-threatening and the office had been reopened.

The incident came a few weeks after several suspicious packages were mailed to prominent Democrats that contained explosive devices.

The New Hampshire Republican Party tweeted Monday night that they "unequivocally condemn this outrageous act."

We immediately and unequivocally condemn this outrageous act and stand with our friends at the @NHDems. We are thankful for law enforcement’s quick and appropriate response, and whoever sent this suspicious package should be brought to justice. #nhpolitics https://t.co/893140yhci — NHGOP (@NHGOP) December 11, 2018

The New Hampshire party's communications director also tweeted that the reported suspicious package was "absolutely unacceptable."

"We settle debates at the ballot box, not by endangering people’s lives. Whoever sent this should be swiftly brought to justice," Joe Sweeney tweeted.

This is absolutely unacceptable and the @NHGOP stands with our friends at the @NHDems. This sort of activity has no place in our politics - we settle debates at the ballot box, not by endangering people’s lives. Whoever sent this should be swiftly brought to justice. #nhpolitics https://t.co/60VUDhu6l3 — Joe Sweeney (@JoeSweeneyNH) December 11, 2018

-Updated on Dec. 11 at 2:19 p.m.