New York City Police Commissioner James O’Neill said Thursday that law enforcement officials are treating the suspicious packages containing possible explosives sent to high-profile Democrats this week as “live devices," not “hoax devices.”

“This is something that should be taken seriously,” O’Neill told reporters at the press conference in New York. “We are treating them as live devices."

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“As far as a hoax device, we’re not treating it that way,” O’Neill added.

His remarks came after some conservatives, including radio host Rush Limbaugh, suggested that the bombs could have been part of a hoax or false-flag operation.

Officials said Thursday that they are treating the suspected bombs as “live devices” and “suspected” explosives. At the same time, they offered little details of the ongoing investigation, refusing to answer even whether they had concluded privately one way or another that the devices were actually meant to explode.

The FBI, along with state and local officials across the country, is spearheading the investigation into, so far, 10 suspicious packages in total.

The packages, all similar in appearance, were addressed to former President Obama, Bill and Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE, billionaire philanthropist George Soros, former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE at the CNN building, Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.), former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements Obama endorses Warnock in crowded Georgia Senate race The Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy MORE, actor Robert DeNiro and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

All were discovered between Monday and Thursday of this week. In almost all of the cases, the packages were intercepted by authorities before reaching the targets. Officials in New York cautioned Thursday that the investigation is in the early stages and ongoing, and warned that further packages could be found.

“We’re doing our best to make sure if there are any out there, we identify them quickly,” O’Neill said.

Authorities have sent all 10 packages to the FBI’s laboratory in Quantico, Va., for further testing.

“We are working quickly to process and analyze relevant information,” said William Sweeney, the assistant director in charge of the FBI’s New York field office. “We will continue to do so for as long as it takes.”

New York City Mayor Bill de Blasio (D) again described the attempted attacks as an act of terrorism.

“It’s absolutely terrorism because it’s an effort to use violence to make a political impact," de Blasio said, echoing language he used the day before.