NEW YORK (CBSNewYork) – With the spate of suspicious packages targeting prominent Democrats and others, authorities want the public to know how to spot a possible mail bomb.

Some of the things to look out for on the outside of the package: A lack of a return address, restrictive markings like “personal,” “overnight delivery,” or “do not x-ray.” Other indicators include poor typing or misspelled names and addresses, or the wrong or misspelled title and name on the package.

Other possible indicators include a rigid or bulky envelope, excessive postage, envelopes sealed with excessive amounts of tape, protruding wires, oily stains on the wrapping, a strange odor or lopsided packaging.

If you suspect a package may be dangerous, the NYPD urges people to leave the area immediately before calling 911. They urge you not to use a cell phone, pager or two-way radio while anywhere near a suspected device.

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(credit: USPS.com)

All 10 of the packages in the current series targeting Hillary Clinton, Barack Obama and others share certain characteristics: All had a return address of Rep. Debbie Wasserman Shultz (sic), the Florida Democrat who is also formerly the chair of the Democratic National Committee. They all came in a manila envelope and had six stamps, and appear to use the same printer for the address labels, which were taped onto the packages.

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Police are investigating a suspicious package sent to Robert De Niro in Tribeca.

The device in each package also appears to be similar, involving PVC tubing, black tape, a timer, and glass for shrapnel.

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An explosive device was found at CNN’s New York officers at the Time Warner Center on Columbus Circle on Oct. 24, 2018. (credit; CNN)

For more information on how to spot a suspicious package from the National Explosives Task Force and United States Postal Service, click here (.pdf).