Fernando Marti's father, Alejandro (right), had reportedly paid a ransom
Mexican police say they have detained five people suspected of involvement in the kidnap and killing of a teenager whose murder sparked national protests.
Prosecutors in Mexico City said those arrested included a former policeman.
The death of Fernando Marti, 14, whose decomposing body was found in the boot of a car in August, led to calls for tougher punishment for serious crimes.
In response, Mexican President Felipe Calderon drew up an emergency programme to tackle violent crime.
At least 2,700 people have been killed and 300 kidnapped so far this year, mostly in drugs-related violence.
Ransom
Mexico City prosecutor Miguel Marcera said Fernando Marti's alleged kidnappers disguised themselves as police officers and set up a bogus checkpoint on a busy street in the capital to capture their victim.
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Mexico marches against recent killings and kidnappings
Last month his decomposing body was found in the boot of a car, even though his father, a wealthy businessman, had reportedly paid a ransom.
Investigators believe Fernando may have been killed because the kidnappers were not satisfied with the money they received.
What is certain is that in a country with abduction and murder rates among the highest in the world, his treatment sparked off a mass protest movement by Mexicans demanding tougher punishment for serious crimes.
After more than 100,000 people held a march in Mexico City calling for an end to such brutal acts, the government was pressured to draw up an programme to tackle violent crime, including a purge of corrupt police officers, and the building of prisons for kidnappers.
Mexicans have grown weary of politicians' promises to do something about the violence, but they hope that for the sake of children like Fernando, the government's pledge to redouble its efforts may start to bear results.
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