Two evacuated train stations in Munich have reopened amid what authorities called an "imminent" terror threat on New Year's Eve.

On Thursday, Munich police cleared out Munich's Hauptbahnhof and Pasing train stations on reports of planned suicide bombings at the transit stops.

Authorities tweeted this message Thursday afternoon:

It reads: "Current indications that in Munich a terrorist attack is planned. Please avoid crowds and the train stations Hauptbahnhof + Pasing.”

The two stations were reopened hours later.

"The Hauptbahnof and Pasing [stations] are now released and open. We remain on site and vigilant," the tweet reads.

Agence France-Presse cited German authorities who say five to seven Islamic State-affiliated individuals are suspected to have planned suicide bombings on New Year's Eve in Munich.

The warnings came just hours before midnight there.

In a statement noted by AFP, Bavaria's interior minister Joachim Herrmann said "The Federal Criminal Authority informed Bavarian police ... that the [Islamic State] was planning an attack" at the Hauptbahnhof and Pasing rail stations.

Here's an outline of the two Münich stations in question:

Revelers in Munich rang in the new year without incident, but law enforcement remains on high alert.

The US Embassy in Berlin issued its own warning, urging US citizens in Germany to "bolster their personal security" amid the ongoing threat of terrorism. Here's more from that statement:

"There is a continuing threat in Europe from persons planning attacks inspired by major terrorist organizations but conducted on an individual basis."

German police secure the main train station in Munich January 1, 2016. REUTERS/Michael Dalder As the world looks back on a year of heightened concerns about terror attacks, law enforcement officials worldwide have been warning people to be cautious.

Security has been tightened in major cities across Europe since the Charlie Hebdo mass shooting in Paris that left 12 dead in January, and the terror attacks in the French capital in November that killed 130 people.

Authorities in the United States have faced similar challenges in the wake of the San Bernardino massacre where 14 people were killed on December 2.

Police in New York arrested one man Thursday for allegedly plotting an attack on a restaurant. That arrest led offcials in Rochester, New York to cancel a previously planned New Year's Eve fireworks show.

Terrorism and, by extension, the threat of mass shootings have remained front-of-mind globally and in the United States in 2015. Since June this year, at least five mass shootings in the US have claimed the lives of 40 people.