A Spanish citizen suspected of belonging to the Basque terrorist group ETA has been arrested in Mexico, the Attorney General's Office said.

Luis Miguel Ipiña Doña is in the custody of the Siedo organized crime unit of the AG's office.

Ipiña has not been charged with any crimes and "his legal situation has not been determined for now," the AG's office said.

The suspected terrorist was arrested on May 20, the AG's office said, without revealing where the arrest was made.

Ipiña "does not have charges pending" in Spain for past terrorist activities, Spanish diplomats told Efe.

The suspected ETA member became a Mexican citizen many years ago and has been living in the country for 26 years, the La Jornada newspaper reported Sunday.

Ipiña lives in Queretaro, a state in central Mexico, the newspaper said.

An unidentified neighbor told police that Ipiña tried to sell him a firearm, La Jornada said.

Ipiña, who is on Facebook, has written a blog since 2008 in which he criticized both the Mexican and Spanish governments, especially operations targeting ETA and arrests of the group's members.

ETA declared a cease-fire on Jan. 10, but the Spanish government considers the move "insufficient" and has demanded that the Basque terrorist organization disband.

ETA, which has declared cease-fires on 11 other occasions since 1981, announced in a video released by the BBC on Sept. 5 that it would not "carry out armed actions" in its quest for an independent Basque homeland.

The cease-fire declaration came after more than one year without fatal attacks and with the terrorist group weakened by operations launched by the security forces in Spain, France and Portugal.

The terrorist group has carried out some two dozen attacks since June 5, 2007, when it ended its unilateral cease-fire with the Spanish government.

ETA declared a "permanent cease-fire" in March 2006 in an apparent attempt to negotiate peace with Prime Minister Jose Luis Rodriguez Zapatero's government.

Most observers, however, regarded the Dec. 30, 2006, attack at the Madrid airport as marking the end of the terrorist group's cease-fire.

ETA, an acronym for the Basque language words for Homeland and Freedom, has killed nearly 900 people since taking up arms in 1968 to seek a Basque nation comprising parts of northern Spain and southern France.