If you realize someone is following you
Proceed to the nearest police station.
Stop a municipal police officer or any law enforcement agents
Go into a bar or another crowded place.
Ask a passer-by for help.
If you noticesomething unusual, hold your bag tightly to you.
Do not carry much money; if you have no choice, ask someone to come with you.
A dog, beside keeping you company, can be a good deterrent against crooks.
Calling the emergency numbers 112 or 113, also from a mobile phone, is free.