Housemate robbed in front of house

I've mentioned that things have been relatively safe since I've been here, with common sense precautions...

However, there have been two incidents in front of the house since I've been here. (though none at the SKIP office which is generally "more dangerous"... )

The first incident occurred during the evening. I wasn't there, but apparently my housemates were in a taxi getting ready to go out, and some guy tapped on the window saying something. Lourdes who is Peruvian, was telling them to not open the door or roll down the window, but apparently no one heard, because they then rolled down the window. The guy then pointed into the car and stated that he left his wallet in the car. They were looking around and he then said something along the lines of having seen it right there and pointed on the ground. I'm not sure at that point who opened the door, but he reached right in and grabbed the purse of one of my housemates. She apparently had keys to our house, ID and money (not sure what else)... After that, we had to change the keys to the house, which was quite expensive.

Second incident was a housemate who was coming back to the house after going to the camera repair store to get her camera fixed. She had only keys, her camera (in a case) and 200 soles (in the case). The cord of the case was wrapped around her hand. As she was unlocking the door, a man ran out, pushed her, and then grabbed the camera case. She has a nasty cut on her hand from it and was quite spooked by the incident. The guy ran into a cab and they drove off (the cab had a passenger in it). Liz and I rode around with her to the tourist police station to have her give a statement so she can claim it on her insurance.

So nothing quite violent... but very close to home...