At least eight suspicious parcels were intercepted before reaching any intended recipients, including Obama’s attorney general, Eric Holder, former CIA Director John Brennan and prominent Democratic Party donor George Soros.

Two packages were sent to California Congresswoman Maxine Waters, the FBI said. Investigators were trying to track down another suspicious parcel they believe was addressed to Obama’s vice president, Joe Biden, a federal official told Reuters late on Wednesday.

None of the eight packages detonated, and nobody was hurt. There was no immediate claim of responsibility.

But news of the bomb threats heightened tension in a nation deeply polarized ahead of elections on Nov. 6 that will decide whether Democrats take control of one or both houses of Congress from Republicans and deny President Donald Trump the majority his party now holds in both.

Some leading Democrats were quick to accuse Trump himself of stoking the potential for political violence by frequently engaging in hyper-partisan, vitriolic rhetoric.

Trump told a political rally in Wisconsin on Wednesday his government would conduct “an aggressive investigation.”

“Any acts or threats of political violence are an attack on our democracy itself,” Trump said. “We want all sides to come together in peace and harmony.”

But he said the media has a responsibility “to stop the endless hostility and constant negative and oftentimes false attacks and stories.”

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