Mexico City ? Three powerful bombs exploded early Monday at a bank, political party’s headquarters and federal election court, raising fears that the kind of political violence that has been raging in the southern state of Oaxaca had arrived in the nation’s capital.

The blasts also sparked concern that long-dormant urban guerrillas had been reactivated.

No one was hurt in the three nearly simultaneous explosions, which occurred just after midnight. One bomb partially destroyed a Canadian-owned Scotiabank Inverlat branch, another seriously damaged the entrance to an auditorium at the headquarters of Institutional Revolutionary Party, or PRI, and the third blew open a steel security door at the Federal Electoral Tribunal.

On Monday evening, local news organizations received a statement from a group saying that it represented a coalition of five guerrilla organizations in Oaxaca that had carried out the Mexico City attacks.