Below are some important numbers that come in handy in case you have to deal with an emergency:

Police (emergency):  101

Tourist Police:  4346-5748/5770  (multi-lingual staff will be able to assist visitors that don't speak Spanish)

Fire Department:  100

Ambulance / Medical Emergency:  107

Foreign Consulates & Embassies in Buenos Aires:

USA:  5777-4533

UK:  4808-2200

Canada:  4808-1000

Germany:  4778-2500

France:  4312-2409