EL PASO, Texas -

Rumors are circulating the Internet of Islamic State of Iraq and Syria (ISIS) militants being based in Juarez and planning attacks in El Paso.

The information was first reported by Judicial Watch, citing unnamed federal sources, and then picked up by other online publications, including National Review.

Breitbart Texas says it has obtained a leaked document warning federal agents about an ISIS related terrorism threat across entire U.S.-Mexico border. Read the Breitbart Texas story at http://bit.ly/1wPeci8

A federal law enforcement source familiar with border security told ABC-7 it is "unverified and unlikely" that ISIS is in Juarez.

U.S. Department of Homeland Security Secretary Jeh Johnson said in news release that there is no specific, credible threat to the U.S. homeland from ISIL, aka ISIS.

“At present, the U.S. Department of Homeland Security and the FBI are unaware of any specific, credible threat to the U.S. homeland from ISIL. Plainly, however, violent extremists who support ISIL have demonstrated the intent and capability to target American citizens overseas, and ISIL constitutes an active and serious threat within the region.”

A DHS spokesman was bewildered by the Judicial Watch report and told the UK Daily MailOnline that "we are aware of absolutely nothing credible to substantiate this claim" made by Judicial Watch.

"In Mexico?" told the Daily MailOnline on the phone. "I haven't seen that at all."

Britain on Friday raised its terror threat level to severe, the second-highest level. The decision was related to developments in Iraq and Syria, but there was no information to suggest an attack was imminent.