I give priority to who injuries at the first one. I will try to first aids for him and send him to the doctor quickly.
After that, I send the rest of group needs to their connecting train and flights home and I tell them I can't to go with them because I will take care the injuries. I think in a situation like this they will understand me between I will borrow mobile phone from other or use public phone to call my manager or my team in company to take care them at train station or airport when they arrive.