A Mexican court has refused to issue an arrest warrant for former President Luis Echeverria and seven others for the 1968 massacre of student protesters.
The ruling came late Wednesday and is the latest setback in the effort by President Vicente Fox's government to prosecute past government atrocities.
On Monday, federal prosecutors filed charges of genocide against Mr. Echeverria in connection with the 1968 incident in which soldiers and police fired on student protesters, killing as many as 30.
Mr. Echeverria was Mexico's interior minister at the time.
Other judges in July dismissed genocide charges against Mr. Echeverria related to the 1971 killings of student protesters when he was Mexico's president.
Some information for this report provided by AP and Reuters.