New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE (D) is calling for a "full investigation" into the death of Jeffrey Epstein, who was found dead of an apparent suicide in jail on Saturday.

"I'm not a conspiracy theorist, but something's way too convenient here, and we need to get down to the bottom of what happened," de Blasio, who is running for president, told reporters at the Iowa State Fair, the Des Moines Register reports.

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Epstein died in a lower Manhattan correctional center, where he was being held on charges of sex trafficking.

Questions have been raised over his death, as he was meant to be monitored every three hours after a prior apparent suicide attempt.

The mayor also called for the investigation into Epstein's alleged sex-trafficking ring, which has been linked to prominent politicians across the political spectrum, to continue.

"Because we're talking about many, many people — likely dozens or more who were involved. His death should not mean that that investigation is dropped," de Blasio told reporters.

Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE has said the FBI will investigate the circumstances of Epstein's death.

The New York Times reported Sunday that Epstein was not being monitored every 30 minutes as directed before he was found dead, according to a law enforcement official with knowledge of Epstein's detention who spoke with the Times.

The Associated Press reported Sunday that prison guards tasked with monitoring Epstein were working mandatory overtime hours.