I have read here of an attack on a solo male traveller.
I would also like to report that I was walking back with my partner along Sarandi 2 weeks ago (21 Nov 2012) when I was knifed and robbed. A young guy grabbed my bag from behind, cut it off with a knife (which also penetrated my neck) and rushed off, jumping on to a motor-bike waiting for him with an accomplice in the driving-seat.
My partner said he caught a glimpse of the attacker and said he gave an impression of a cultured person, fairly well-dressed.
A very kind Uruguayan man took us to the police station where an officer made a report. As with the attack on the previous guy, I got the impression that the police were going to do absolutely nothing. They also wouldn't give me a copy of the report they made.
We are a retired couple from the UK, have travelled extensively in Central and South America and we both speak Spanish. This is the first time in all our 6 years of travel in the region that there have been any such incidents. I had to seek hospital and also osteopathic treatment for neck wounds and shoulder stiffness.
If the government here are serious about wishing to promote tourism, they must take on board and tackle growing levels of attacks. Of course, this could happen anywhere, but everyone we spoke to knew of attacks in the Old Town, so this is known to be a danger spot, yet we never before or since saw a single police officer in the area.