Claiming to have some sort of emergency, they may say that they had their purse or wallet stolen, that they were arrested, or that they have been injured. They prey on the emotions of the vacationer's loved ones, who are always willing to respond quickly.
If one of your friends or family members has an emergency overseas, to protect yourself from being scammed, try to slow down. Approach any requests for having money sent with extreme caution.
Take the time to double check with other people that your loved one is in contact with, and try to reach the person vacationing directly. Find a secure way to send money to the person, and always keep a receipt so that the transfer can be traced.