NEW YORK - A Filipino-American pleaded guilty on Thursday to criminal charges in connection with the mailing of bombs to prominent Democrats and other critics of US President Donald Trump.

Cesar Sayoc, 57, entered his plea before US District Judge Jed Rakoff in Manhattan federal court.

Among the charges were using a weapon of mass destruction, mailing explosives with an intent to kill or injure, and transporting explosives across state lines.

Sayoc, a part-time pizza deliveryman, grocery worker and former stripper, was arrested in October after a four-day manhunt.

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At the time, Sayoc had been living in a white van plastered with pro-Trump stickers, the slogan "CNN SUCKS" and images of Democratic leaders with red cross-hairs over their faces.

Prosecutors accused Sayoc of mailing bombs through the US Postal Service to Democrats such as former US Presidents Bill Clinton and Barack Obama, former Vice President Joe Biden, and Senators Cory Booker of New Jersey and Kamala Harris of California.

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Other targets included actor Robert De Niro and former Central Intelligence Agency directors John Brennan and James Clapper, who have criticized Trump, and Democratic donors George Soros and Tom Steyer, prosecutors said. Trump is a Republican.

The bombs were sent in manila envelopes lined with bubble wrap and consisted of plastic 6-inch pipes packed with explosive material and wired to small clocks and batteries, according to prosecutors. All were intercepted before reaching their intended targets, and none exploded.