MEXICO CITY, June 12 (Reuters) - Mexico deported a man on Tuesday who is wanted by Spanish anti-terrorist police for suspected involvement in the Basque separatist group ETA, a week after the group said it was ending a 15-month ceasefire.

Migration authorities found Andoni Azpiazu Alcelay in the city of Cuernavaca, thanks to an anonymous tip, and expelled him because he lacked a visa, Mexico's government said.

Earlier, Spain said Mexico detained a similarly named man, wanted in connection with financing terrorism and a bomb explosion in Pamplona in December 1999, in a joint security operation with the United States.

ETA, which has been fighting for an independent Basque state in northern Spain and southwestern France for four decades, said last week it was abandoning a ceasefire it had declared in March 2006.

The government of Spanish Prime Minister Jose Luis Rodriguez Zapatero started exploratory peace talks in mid-2006, but broke them off at the end of the year after ETA killed two people with a bomb at Madrid's airport in December.

In 2006, Mexico extradited six people to Spain for suspected links to ETA after a three-year legal battle.

In the mid-1990s, Mexico signed a extradition treaty with Spain in which it ceased to treat suspected terrorists as political refugees.

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