ISIS has been calling for “lone wolf” attacks on hurricane relief centers in Houston and Miami, according to a report.

Confidential government intelligence documents obtained by CNBC outline the proposed threats and describe how law enforcement officials were advised to be on the lookout for terror-related activity after spotting threatening messages on Twitter.

The internal info, dated Sept. 14, is from the Department of Homeland Security’s Southeast Florida Fusion Center. It also mentions calls for attacks in other cities, as well — including the Big Apple.

“On Sept. 11, there was a twitter posting that appears to be authored by the Islamic State of Iraq and Syria (ISIS) that threatens Washington, New York, Los Angeles, Houston, Miami and Las Vegas,” the document says, according to CNBC.

The document goes on to mention a Newsweek article from earlier this month citing a different ISIS posting calling for lone-wolf attacks on Houston relief centers in the wake of Hurricane Harvey.

“To all the (lone mujahids) in the U.S. (warrior), pop down to Houston and drop in at any of the relief centers housing displaced people from the Houston floods, make sure to bring lots of supplies/gadgets/toys to see if you can help put any (unbeliever) out of their misery,” the post said.

Terror experts said the orders from ISIS were likely “more aspirational then operational, with hopes that their followers would then act on calls for attacks.”

“Incidents involving lone wolf attackers have demonstrated the potential danger, lethality and effectiveness of a rehearsed small arms or knife attack that can be carried out by a single individual with little or no training,” one analyst said in the documents. “It also underscores the potentially higher consequences of an assault attack involving multiple operatives.”