They said 53 civilians, 41 federal police agents and 14 state police agents were injured.
Riot police agents holding a barrier thrown during today's demonstrations in Madrid.
Antiterrorism police agents will continue to investigate the incident, the officials said.
On 27 March, ELN fighters killed two police agents in the south-western province of Nariño.
Jerzy Urban, the spokesman for General Wojciech Jaruzelski, claims that the arrested security police agents were acting on their own.
According to his mother, who witnessed the killing, Ángel Joel Torrealba, 16, was killed in his bed by police agents.
News accounts said police agents entered the electoral council headquarters early on Wednesday and seized part of the electoral database.
Photograph: Javier Lizon/EPA Protesters clash with riot police agents during the demonstation held to support the coal miners today.
Some of the participants tried to force anybody wearing a hood to take it off, accusing those who refused of being anarchists or undercover police agents.
The documents made possible the 2011 conviction of two police agents for the kidnapping, in 1984, of a labor activist, Edgar Fernando García.
Many former Eastern Bloc countries, including Germany and the Czech Republic, banned former Communist Party functionaries and secret police agents from state employment.
