Vienna police tightened security Saturday as a precautionary measure after numerous European capitals were warned of the possibility of an attack with explosives and firearms between Christmas and New Year. While security has been increased, authorities do not see any reason to cancel any events in the coming days.

Authorities from the Austrian capital claimed in a statement that the tip came from an unidentified "friendly" intelligence service a few days before Christmas. They were also given a list of places that would be targets of potential attacks, but they have so far yet to see "concrete results" through further investigation into the list, according to Fox News.

"Overall, this is a lead, which stipulates a higher than general abstract state of danger," the Vienna police said.

Among the security measures being undertaken by the police is initiating more security checks and increasing vigilance for suitcases and bags in order to ensure quick readiness in case of an emergency, especially at key events and high traffic areas, CNN reported. 

Vienna police were not available for further comment. The tip comes six weeks after 130 people were killed in terrorist shootings in Paris, and it was pointed at a higher threat level than the "the general abstract" level cited earlier, Vienna police said while asking Austrians for their understanding for more controls, according to The Sydney Morning Herald.

Surveillance in crowded spaces will be carried out along with heavy identity checks. Objects that can carry explosives, such as bags and bicycle frames, will be given strict alertness, the tip further explained.