There is an interesting article in the newspaper today about robberies.
it suggests that there has been quite an increase in robberies of pedestrians often by motorcyclists. But the good news is that robberies on buses is down.
There is a map showing the streets that have had the most crime.
http://www.elpais.com.uy/informacion/avenidas-riesgo-rapinas.html
Take care and be safe.