"This post was unacceptable, made in error, and does not reflect the views of the Department,” a statement read.

The department called its social media post “offensive and inappropriate” and said it was investigating how it had been published.

On Sunday, Homeland Security Secretary Kristi Noem issued a National Terrorism Advisory System (NTAS) bulletin warning that, while no specific credible threats have been detected, the U.S. is in a “heightened threat environment” as a result of the American attack on Iran.