NEW YORK: Hollywood megastar Robert De Niro and former US vice president Joe Biden were the latest targets in a spree of 10 devices and pipe bombs sent to opponents of Donald Trump, but a nationwide manhunt revealed no major public leads Thursday, reports AFP. Hundreds of officers from the FBI, US Secret Service and dozens of other agencies are searching round the clock for the culprit or culprits behind the 10 suspect packages that politicians on all sides have branded “terrorism.”

Since Monday, crude, homemade bombs and other suspected explosive devices have been addressed to Barack Obama, Hillary Clinton, CNN, liberal billionaire donor George Soros and other figures loathed by US President Donald Trump’s supporters. Packages have been intercepted in New York, Maryland, Florida, Delaware and Los Angeles.

“It does remain possible that further packages could or have been mailed,” assistant FBI director William Sweeney said, confirming that “some” packages had been sent through the US postal system. So far, no one has been hurt, but the attempted bomb-spree has frayed nerves and raised tensions.

On Thursday evening, New York police sent the bomb squad to investigate two unattended packages at the Time Warner Center, where CNN’s New York bureau was evacuated a day earlier after a pipe bomb was found in the mail room.

Police later issued an all clear and said the mall was being re-opened. In Miami, also late Thursday, police sent a bomb squad to a US Postal Service facility to assist federal agents “as part of the ongoing investigation into suspicious packages” found elsewhere, the Miami-Dade Police said on Twitter.

US media report that at least some of the packages have been sent from Florida. “We will identify and arrest the person or people responsible for these acts. Make no mistake,” New York police chief James O’Neill told a news conference, refusing to divulge any leads investigators may have.