Another suspect has been arrested in connection with the killing earlier this year of Mexican poet Javier Sicilia's son and six other young men, the Guerrero state Attorney General's Office said.

Daniel Perez Patricio and two other people were arrested by the Federal Police on Oct. 5 in the city of La Venta, the AG's office said.

The three suspects were arrested at a police checkpoint for driving a stolen vehicle, Guerrero Attorney General Alberto Lopez Rosas said.

Perez Patricio told investigators that he was involved in the killings, which rocked Mexico and prompted Sicilia to launch a national peace movement.

Juan Francisco Sicilia and six friends were murdered on March 27 in the central state of Morelos.

Perez Patricio's role in the case was not revealed until Monday, when he was paraded before the press.

The 24-year-old Juan Francisco Sicilia and his friends were killed because two of the young men reported an extortion attempt to authorities, who were investigating the case when Pacifico Sur cartel gunmen abducted, tortured and murdered them, officials said.

Julio de Jesus Radilla Hernandez, the leader of the Pacifico Sur drug cartel, ordered the young men killed, prosecutors said.

The 34-year-old Radilla was arrested by the Federal Police in May.

Perez Patricio told investigators that he worked as a lookout for Radilla in Juitepec, a city in Morelos, Lopez Rosas said.

The suspect will be prosecuted by state authorities for auto theft and federal prosecutors will handle the charges against him related to the Sicilia case, the AG said.

Javier Sicilia, considered one of Mexico's best writers, reacted to his son's killing by organizing protests and marches against the drug-related violence that has claimed more than 40,000 lives in Mexico since December 2006.

The poet and journalist has called on Mexicans to push for an end to President Felipe Calderon's war against the country's drug cartels.

The poet has rallied Mexicans who are fed up with the drug-related violence that has claimed the lives of tens of thousands of people in the past few years and a government strategy that has done little to stem the killing.

"The reality of each day is that we have people dead, we are afraid, the streets belong to organized crime," Sicilia said in a speech after his son's slaying.

The poet has criticized both Calderon's decision to militarize the war on drugs and the criminalization of innocent victims and their families.