The U.S. Embassy In Kabul, Afghanistan issued an emergency warning for U.S. citizens in the region Monday, citing "credible reports of an imminent attack."

"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, noting that there are no details available about the attack's target or method, only mentioning that its possible with the next 48 hours.

The embassy frequently issues such warnings, however the latest one comes as the leaders of Afghanistan and Pakistan are expected to meet on the sidelines of the UN climate change conference in Paris, according to AFP.

"A meeting between [Pakistan Prime Minister Nawaz Sharif ] and [Afghan President Ashraf Ghani] on the sidelines of the UN climate change conference is likely," a Pakistani official said on condition of anonymity.

A meeting between the two could be the first step towards resuming Islamabad-brokered Taliban peace talks, however its noted that Kabal has turned increasingly bitter over Islamabad's backing for the Taliban who have stepped up attacks on Afghan government facilities in recent months.

In the meantime, the State Department maintains sentiments made in a travel warning for Afghanistan earlier this month in the wake of the terror attacks in Paris.

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