President Felipe Calderon called on Mexico's states and people in a recorded message to back the government's war on drugs.

"We need to redouble our efforts and we need you, all the citizens, to win this struggle," Calderon said in his message, adding that "your understanding and the support of all society is essential."

Calderon's message to the nation was released on Wednesday, a day before a national march against violence led by poet Javier Sicilia, whose son was murdered in March, started.

No one likes violence, but operations will continue until the 32 state police forces and prosecutors' offices have been cleaned out, the president said.

Calderon referred to the "murders of seven young men, recently, in Temixco, Morelos. It is an event that has rocked society's conscience."

Several of those responsible for the murders have been arrested and "we are going to persevere until all of them are found and we will make them pay for their crimes," Calderon said.

Sicilia's 24-year-old son, Juan Francisco Sicilia, and six other young men were murdered on March 27 in the central state of Morelos.

The young men were murdered on drug trafficker Julio de Jesus Radilla's orders at a house in Jiutepec and were taken to the city of Temixco, where the bodies were found, one of the suspects told investigators.

The peace march organized by Sicilia left Cuernavaca, the capital of Morelos, on Thursday and is expected to reach Mexico City in three days.

If the government pulls out of the war on drugs, "we are going to let bands of criminals go into the streets across Mexico with impunity, attacking people and with no one to stop them," Calderon said.

The president called on parents to help change the culture of crime and strengthen respect for the law.

"As fathers and mothers, you can do a lot for Mexico by becoming closer to your children," Calderon said.

The president urged parents to discuss the dangers of drugs, gangs and violence with their children.