Suspect arrested after explosive devices sent to Trump critics and CNN

FBI Miami is aware of a suspicious package mailed to Congresswoman Debbie Wasserman-Schultz's office in Sunrise, Florida, spokesman Jim Marshall told CNN.

Marshall said FBI agents are on the scene along with local law enforcement partners.

Two law enforcement sources tell CNN that the suspicious package was sent to Eric Holder, but it had the wrong address and was returned to Debbie Wasserman Schultz’s office in Florida because the congresswoman's address was the return label on the package.

The same return address was also used for the suspicious packages addressed to Hillary Clinton and Barack Obama.

New York Gov. Andrew Cuomo was just asked after his news conference if he has a message for President Donald Trump.

He added, "For everyone’s sake, the President, the Senate, the Congress, the governors, bring down the rhetoric.”

National Counterterrorism Center spokesperson Maura Beard tells CNN that officials there have not yet reached a conclusion that there is a connection to foreign terrorism with the suspicious package.

NCTC says the FBI has the lead for the investigation and added that they will continue to collaborate with all law enforcement agencies. 

Earlier today, New York City Mayor Bill de Blasio said at a news conference that the device found at the CNN building is "clearly is an act of terror."

CNN's New York offices and studios remain evacuated, more than three hours after the suspicious device was delivered to the mailroom.

"The security sweep of our building continues," CNN President Jeff Zucker said in a 1 p.m. ET update to staffers.

In the meantime, staffers are working from nearby hotels, restaurants and other locations.

"I want to commend all of our colleagues in New York, in particular, and elsewhere, who have helped keep us on the air as this crisis has unfolded," Zucker wrote. "I am really proud of all of you. Thank you."

FBI Special Agent in Charge C. Bryan Paarmann says that “so far the devices have been what appear to be pipe bombs.”

Potentially explosive devices have been mailed to Hillary Clinton, Barack Obama, liberal billionaire George Soros, former FBI director John Brennan and Former Attorney General Eric Holder over the past few days.

A Time Warner Center mailroom employee flagged the package to security, but did not open it, according to a source with direct knowledge.

Security called authorities, who opened the package.

Despite today's news, a mail bomb is still an extremely rare occurrence -- and that's why it's noteworthy that officials are dealing with several potential bombs today.

Here's how rare it is: According to the US Postal Inspection Service, the postal service processes more than 170 billion pieces of mail every year. Over the last few years, the number of mail bombs inspectors have investigated? An average of 16. That, according to the agency, works out to be an average of less than 1 in 10 billion.

Two law enforcement sources tell CNN that a suspicious package has been intercepted at a Congressional mail screening facility in Capitol Heights, Maryland. 

The Capitol Hill Police bomb squad is on the scene.

New York Gov. Andrew Cuomo said a device was sent to his office in Manhattan.

The governor added that the device was also "being handled."

Cuomo also said he would not be surprised if more devices were found.

“As you’ve heard there’s a number of devices and there’s a pattern apparently with them," he said.

The FBI says it is “working in coordination with our law enforcement partners to investigate the suspicious packages."

With CNN's Mary Kay Mallonee