Germany received a tip hours before midnight that named militants from Iraq and Syria were planning attacks in Munich but police have been unable to find the suspects and are not even sure if they exist or are in the country, the Munich police chief said Friday.

Hubertus Andrae told a news conference that German officials had received a "very concrete" tip that suicide attacks were planned on New Year's Eve at two train stations.

Police closed the stations about an hour before midnight, and reopened them hours later.