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Aug. 2 (Bloomberg) -- A Mexican guerrilla group that took responsibility for attacks on the state oil company last month said it bombed a Sears store yesterday in southern Mexico, a chain owned by billionaire Carlos Slim.

The bomb that exploded in the Sears Roebuck de Mexico store in the city of Oaxaca caused no injuries, according to local police. Mexico's Televisa network showed broken glass from the explosion and damage to the store's entrance. Police also found a bag containing explosive material inside a branch of Citigroup Inc.'s Banamex unit.

The latest action by the Popular Revolutionary Army, or EPR, shows the group intends to follow through on its promise to continue bombings until authorities return two of its missing members. The wording used in its latest statement also signals the EPR plans to challenge the legitimacy of President Felipe Calderon's government.

``Our actions do not seek to intimidate the population or inhibit citizen participation in the coming electoral process,'' the group said in a statement posted on the Center for Documentation of Armed Movements Web site. Rather, the attacks seek to ``strike the interests of the national and foreign oligarchy.''

The office of Mexico's attorney general said in a July 11 press release that no federal prison held the EPR members mentioned in its statements.

A spokesperson for Slim's companies had no comment.

`Forbes List'

In yesterday's communiqué, the EPR continued to link Calderon to the governor of Oaxaca state, Ulises Ruiz. Calderon's predecessor, Vicente Fox, sent more than 4,500 federal police to Oaxaca city last year to break up a blockade of groups demanding that Ruiz resign.

The statement accused both Ruiz and Calderon of treating widespread social discontent as concern of ``minority groups.'' In an seeming reference to Slim, who is the world's second- richest person according to Forbes magazine, the group said:

``For them, the minority is the population that does not appear on the Forbes list.''

Last month, the EPR said it bombed a pipeline operated by state-owned oil monopoly Petroleos Mexicanos in two separate attacks. The damage cut natural-gas service for hundreds of residents and companies in four central Mexican states.

More than 100 companies in Mexico, including automaker Nissan Motor Co. and cereal maker Kellogg Co., reduced or halted production.