US issues Mexico travel warning

The US State Department has extended its travel warning for Mexico because of concerns over drug-related violence.



Three more states have been added to the list of places it says Americans should avoid.



The warning said the states of Michoacan and Tamaulipas, as well as parts of Sinaloa, are all troubled by violence and organized crime.



However the state department has also noted that millions of US citizens visit Mexico safely each year.



The state department had previously warned Americans against unnecessary travel to parts of the northern states of Chihuahua, Durango and Coahuila.



The areas affected by the warnings include popular tourist attractions such as the Copper Canyon in Chihuahua and the mountains of Michoacan, where Monarch butterflies migrate in one of nature\'s great spectacles.