Homeland Security Sees ‘No Specific, Credible Threat’ From Iran, but Warns of Cyberattacks

Soon after Maj. Gen. Qassim Suleimani, Iran’s top military leader, was killed in a drone strike, the chief of cybersecurity at the Department of Homeland Security warned the public that it was “time to brush up” on Iran’s efforts to attack computer systems in the United States, even as the department’s acting secretary said that “no specific, credible threats” to the country had emerged since the general’s death.

Chad F. Wolf, the Homeland Security Department’s acting chief, convened senior officials on Thursday night and Friday morning to discuss how to respond to Iran’s threat of a “forceful revenge” against the United States for the death of the second most powerful official in Iran.

Computer systems quickly emerged as potential targets. Christopher C. Krebs, the department’s leader on cybersecurity, made clear on Twitter that the threat went beyond the federal government.

“Pay close attention to your critical systems,” Mr. Krebs said in the tweet. “Make sure you’re also watching third party accesses!”

The warning was the most specific security action described by the Department of Homeland Security on Friday in light of General Suleimani’s death. Some Democrats and former Homeland Security officials raised concerns that the lack of information from the Trump administration on plans to defend the country showed that a department created after Sept. 11, 2001, to protect the country from terrorism has been transformed into one increasingly focused on immigration.

“We have seen little of substance from the administration — including the Department of Homeland Security — on how it is planning for any contingencies,” said Representative Bennie Thompson, Democrat of Mississippi and the chairman of the Homeland Security Committee. “D.H.S.’s core mission is to keep us safe from potential attacks, but under this administration it has been almost singularly focused on immigration and has been without a permanent leader since April.”

Mr. Wolf said in a statement that he met with agency officials on Thursday night and Friday morning “to assess potential new threats and component actions to respond to the constantly evolving threat landscape.” Later on Friday, he said on Twitter that “there is no specific, credible threat against the homeland,” but that the department’s agencies would increase security “when necessary and prudent.”

He said the agency was monitoring the situation in the Middle East with local and federal law enforcement agencies. Some police departments, including in New York City and Chicago, deployed additional officers to potential targets.

The Homeland Security Department also may update the National Terrorism Advisory System to warn of a potential cyberattack from Iran, according to an official familiar with the discussions. The system’s bulletins, which are shared among law enforcement throughout the country, had not been updated with that information as of Friday night.

Lt. Cmdr. Scott McBride, a spokesman for the Coast Guard, said “no known specific threats” to the nation’s ports had emerged to “warrant an increase in our operating posture.” There was also no indication from the Transportation Security Agency that airports were responding to a rising threat.

Typically, after an attack or threat is made against the United States, the Department of Homeland Security will host a call with leaders of the 50 states to share information and advise on security protocols. Information on potential threats or leads for investigations are shared through dozens of fusion centers that are partially funded by the department.

Homeland Security also typically communicates with faith-based or community organizations that may be specifically targeted by a threat. Customs and Border Protection, an agency within the Homeland Security Department, is responsible for vetting who enters and exits the country, in addition to patrolling the border.

The department also oversees the Cybersecurity and Infrastructure Security Agency, which will take the lead on communicating with the private sector to prevent a large scale retaliation from Iran, current and former department officials said.

In his tweet, Mr. Krebs referenced a statement issued last summer from his agency warning of “a rise in malicious cyber activity directed at United States industries and government agencies by Iranian regime actors and proxies.”

In that statement from June, Mr. Krebs said Iran does not just aim to steal data and money. “What might start as an account compromise, where you think you might just lose data, can quickly become a situation where you’ve lost your whole network,” he said.

But former Homeland Security Department officials said there is concern that as Iran’s efforts have grown more sophisticated — to include cyberattacks and proxy organizations to carry out targeted acts of violence — the department is less prepared as it has moved away from its original mission in order to implement Mr. Trump’s immigration agenda.

The White House this past year purged multiple career officials from the agency and replaced them with officials willing to aggressively restrict immigration — including some who share Mr. Trump’s taste for harsh rhetoric in describing such migrants. The concern over the state of the agency was expressed publicly in September, when former secretaries of the department convened for a Senate hearing hosted at the 9/11 Memorial Museum in New York.

“Any assessment of Homeland Security must include an assessment of today’s Department of Homeland Security,” Jeh Johnson, a former Homeland Security secretary in the Obama administration, said at the hearing. “I confess that I view today’s D.H.S. with despair and dismay. The department appears to be under constant siege and constant crisis.”

But Michael Chertoff, former Homeland Security secretary in the Bush administration, said in an interview that the department has the tools to defend against an Iranian attack through the Transportation Security Administration and the cybersecurity division.

“Certainly this isn’t a new threat,” Mr. Chertoff said.

John Cohen, a former acting under secretary of Homeland Security for intelligence who led the agency’s efforts to counter Iran, said the White House and the Homeland Security Department must develop a comprehensive plan after Iran’s threat, and then work with local governments to implement it. He is dubious that will happen.

“There has been real concern that the focus on immigration enforcement and the border wall have degraded our capabilities to address not only the threat posed by domestic terrorists but sophisticated threats like this,” he said. “Time will only tell.”

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