(CNN) — The U.S. Embassy in Kabul has received credible reports of an imminent attack in the Afghan capital, the Embassy said Monday.

The threat is for a possible attack in the next 48 hours, the Embassy said in a statement.

“During this period of heightened threat, the U.S. Embassy strongly urges U.S. citizens to exercise extreme caution if moving around the city,” the statement said.

“There were no further details regarding the targets, timing, or method of the planned attack.”

The U.S. State Department continues warning American citizens against traveling to Afghanistan.

“The security situation in Afghanistan is extremely unstable, and the threat to all U.S. citizens in Afghanistan remains critical,” the State Department said.

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