Rise in Mexico's drug related murders

Mexican officials say nearly 13,000 people were killed in violence blamed on organised crime between January and September 2011.

This means there have been 47,515 drug-related killings since President Felipe Calderon launched his crackdown on drug traffickers in late 2006.

Officials said the 11% rise in murders was far slower than in previous years.

But with presidential elections in July, violence is set to be a key issue for voters.

Will Grant reports from Mexico City.