They include Edgar Millan Gomez, the acting head of Mexico's federal police force, who was shot dead in an ambush outside his home in Mexico City in early May. 
Drug routes
More than 2,500 people are thought to have died in drug-related violence this year including about 200 alone in Juarez, opposite the US city of El Paso in Texas.
The death toll comes despite the president deploying more than 1,000 troops and heavy weaponry in the city.
Calderon has deployed 25,000 troops and federal police to fight drugs cartels across Mexico since 2007.
The number includes 2,700 troops deployed last week to the coastal state of Sinaloa, home to a group of drug gangs allegedly run by Joaquin "Shorty" Guzman.
Violence has surged in Juarez as the gang and its main rival, the Gulf Cartel, compete for the most lucrative smuggling routes over the US border.