WASHINGTON (AP) — The Latest on pipe bombs sent to prominent critics of President Donald Trump (all times local):

7:02 p.m.

A law enforcement source tells The Associated Press that Miami-Dade police have gone to the mail-sorting facility in Opa-Locka, Florida, at the request of the FBI in connection with the suspicious package investigation.

The source says it was a precautionary measure.

The law enforcement source was not authorized to discuss an ongoing investigation and spoke on condition of anonymity.

Suspicious packages were sent to prominent critics of President Donald Trump.

Postal inspectors are searching mail facilities for packages matching the 10 sent over the last four days.

No new packages containing explosives have been identified since Thursday morning.

— By Curt Anderson in Miami

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6:25 p.m.

U.S. Rep. Debbie Wasserman Schultz got emotional as she briefly talked about her name appearing in the return address on 10 suspicious packages sent to prominent critics of President Donald Trump.

One of the packages was delivered to her Florida office Wednesday when it was returned by the Postal Service. Her name was misspelled on the label. It was addressed to Eric Holder, former U.S. Attorney General under President Barack Obama.

Her voice breaking, she said her staff handled the threat with bravery.

Wasserman Schultz was speaking at a Fort Lauderdale-area synagogue Thursday during a campaign event.

Wasserman Schultz is a former chairwoman for the Democratic National Committee.

Postal inspectors are searching mail facilities for packages matching the 10 sent over the last four days.

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5:25 p.m.

A law enforcement official tells The Associated Press that investigators hunting for the source of package bombs sent to critics of President Donald Trump suspect that some of the parcels were mailed from Florida.

The official said Thursday that investigators have been examining a database of images of mail maintained by the U.S. Postal Service. It has provided clues pointing investigators toward the state.

The official wasn’t authorized to discuss the investigation and spoke on condition of anonymity.

U.S. Postal Inspection Service spokesman Philip Bartlett says that postal employees and inspectors are searching mail facilities for packages matching the 10 sent over the last four days.

No new packages containing explosives have been identified since Thursday morning.

— By Tom Hays in New York

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4:55 p.m.

Former Vice President Joe Biden says America has to “turn off this hate machine” after authorities intercepted two mail bombs addressed to him.

Biden called for increased civility during a Thursday campaign stop in Lancaster, New York, outside of Buffalo.

Biden says he hopes the package bombs addressed to him, former President Barack Obama, Hillary Clinton, CNN and others, have been “enough of a shock wave to say OK, enough is enough.”

He says that Democrats and Republicans can disagree on health care but that personal attacks have “got to stop.”

Two packages addressed to Biden were intercepted at Delaware mail facilities in New Castle and Wilmington.

Investigators are trying to determine whether the devices were intended to detonate or whether they were simply sent to sow fear.

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4:25 p.m.

Investigators say some of the package bombs targeting critics of President Donald Trump were sent through the U.S. Postal Service, but that no new ones have been found in the mail system the last eight hours.

U.S. Postal Inspection Service spokesman Philip Bartlett said Thursday that postal employees and inspectors are searching mail facilities for packages matching the 10 sent over the last four days.

New York City Police Commissioner James O’Neill said investigators are treating the devices as if they’re real and dangerous.

Deputy Commissioner John Miller said a retired NYPD detective who works in security reported a package addressed to Robert De Niro on Thursday after seeing images of the other package bombs on TV.

Similar packages were also sent to former President Barack Obama and Hillary Clinton.

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3:10 p.m.

Investigators probing crude pipe bombs sent to prominent Democrats are trying to determine whether the devices were intended to detonate or whether they were simply sent to sow fear.

That’s according to two law enforcement officials who said the devices were not rigged like a traditional booby trap package bomb that would explode upon opening.

The officials said they didn’t appear to have a trip wire or ignition.

The officials weren’t authorized to discuss an ongoing investigation publicly and spoke to The Associated Press on condition of anonymity.

The four-day mail-bomb scare widened Thursday as law enforcement officials recovered three more devices.

The packages addressed to former Vice President Joe Biden and one to actor Robert De Niro were similar to crude pipe bombs sent to former President Barack Obama, Hillary Clinton and CNN.

— By Colleen Long and Michael Balsamo in Washington

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11:45 a.m.

New York City Mayor Bill de Blasio is hailing the “quick-witted work” of a security guard who alerted authorities to a suspicious device at Robert De Niro’s Manhattan office.

Two officials told The Associated Press on Thursday that a person working at the building with a law-enforcement background called police after seeing images of a package bomb sent to CNN and recalling a similar package addressed to De Niro.

De Blasio said: “Thank God there were no injuries.”

De Blasio said the device removed from De Niro’s office “was very similar to the devices that have located within the last 48 hours” at CNN and locations connected to prominent Democrats.

He said all of them appear to be from the same sender and it’s “clearly an effort to terrorize people politically, to choose people for political purposes and attack them because of their beliefs.”

De Blasio said the device is being examined at an NYPD facility in the Bronx.

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11:10 a.m.

The FBI is confirming packages addressed to former Vice President Joe Biden and actor Robert De Niro are similar in appearance to those used to send bombs to prominent Democrats.

The FBI provided the update in a tweet Thursday morning.

New York City police early Thursday recovered a package addressed to De Niro with the same return address used on the other packages.

A law enforcement official said two packages addressed to Biden were intercepted at Delaware mail facilities in New Castle and Wilmington.

The official wasn’t authorized to discuss an ongoing investigation publicly and spoke on condition of anonymity.

Pipe bombs addressed to Hillary Clinton, former President Barack Obama, former CIA director John Brennan and former Attorney General Eric Holder have also been intercepted in recent days.

— By Eric Tucker and Michael Balsamo in Washington.

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10:30 a.m.

Law enforcement officials say the suspected explosive device sent to Robert De Niro may have been sitting in the mailroom of his building for a day or more before it was discovered.

Two officials told The Associated Press on Thursday that a person affiliated with the Tribeca Film Center was off work when he saw an image on the Internet and elsewhere of the package containing a crude pipe bomb sent to CNN.

That person, who has a background in law enforcement, recalled seeing a similar package at the film center mailroom earlier and reported it to police.

Emergency service officers were dispatched early Thursday to retrieve it. It had the same return address used on the other packages. An official said it was suspected to have been delivered earlier this week.

The two officials weren’t authorized to discuss the investigation and spoke on condition of anonymity.

— By Colleen Long in Washington and Tom Hays in New York.

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9:55 a.m.

A law enforcement official says a second package addressed to former Vice President Joe Biden has been intercepted at a mail facility in Wilmington, Delaware.

The official says it has similar markings and characteristics as the packages containing bombs sent to other prominent Democrats.

The official said another package addressed to Biden was also found Thursday morning, that one at a postal center in New Castle, Delaware.

The official wasn’t authorized to discuss an ongoing investigation publicly and spoke to The Associated Press on the condition of anonymity.

Several packages containing pipe bombs packed with shards of glass have been intercepted in the last few days. They targeted Hillary Clinton, former President Barack Obama, CNN and others.

A New York City police bomb squad has recovered a suspicious package addressed to Robert De Niro.

— By Eric Tucker and Michael Balsamo