Barcelona is not a dangerous city, but as in every city in the world, you still have to be careful. Do not display valuables and do not leave personal items unattended. Take special care at night and in tourist areas like La Rambla.
Police Barcelona: 0034 092
National Police: 0034 091
Firefighters: 0034 080
Lost and Found office: 0034 010
Phone numbers for canceling stolen credit cards
Visa / Mastercard: 900 971 231/900 991 216
American Express: 902,375,637