The elections being held by Mexico's Party of the Democratic Revolution, or PRD, for slots on the political council and national congresses were suspended over the weekend due to a dispute between supporters of Mexico City Mayor Marcelo Ebrard and former presidential candidate Andres Manuel Lopez Obrador, party members said.

Ebrard's supporters burst into the offices where election materials were being put together on Saturday night, Lopez Obrador's supporters said in a statement.

A group of protesters gathered in front of the party offices on Sunday morning and marched to city hall to demand the removal of those who made the decision to suspend the elections.

Lopez Obrador supporters led by Dolores Padierna and Julio Cesar Moreno accused Ebrard of engineering the election's cancellation and demanded that he and his allies be removed for "kidnapping the Federal District elections packets."

The disputes occurring in party elections "are the exclusive responsibility of its members, especially the leaders," and Mexico City officials play no role in them, the Federal District's Government Secretariat said.

"We respect the PRD's internal processes for deciding in a democratic manner and according to its own rules the manner for organizing itself, who will lead it and who will represent it," the secretariat said.

Irregularities led to the suspension of party elections in four other states, the PRD's National Elections Commission said.

The elections have been rescheduled for Oct. 30 in Chiapas, Zacatecas, the Federal District, Oaxaca and Veracruz, the commission said.

Party members agreed to a unified list in Baja California Sur state, allowing them to avoid an election, while the process is taking place in an "acceptably normal" manner in the rest of the country, the commission said.

Lopez Obrador, who narrowly lost the 2006 presidential election to Felipe Calderon, and Ebrard are the leftist PRD's leading candidates for the July 1, 2012, election.

The polling firms that will conduct field surveys for the PRD will be determined later this month, the party said a few weeks ago.

The PRD candidate usually represents the left, traditionally receiving the support of the Workers Party, or PT, and the Convergencia movement.