And don't stay angry about it. It's done and over and there is nothing that can be done. As all the others have said, the loss of material items is nothing compared the the safety/well being of you and your friends.
If it's any consolation, I know a priest who is from my hometown who is a missionary in your country. He's been mugged three times I believe and it doesn't deter him from doing what he does. I know your gut instinct is to wish you had a weapon and to attack back, but in the end, it's not worth putting yourself at risk let alone the others around you.
_ _ - - = = Pr3tty F1y = = - - _ _