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
