UPDATE: Bolivia's president announces his resignation

LA PAZ, Bolivia (AP) — The latest on the political crisis in Bolivia (all times local):

5:15 p.m.

Bolivian President Evo Morales has announced his resignation, seeking to calm the country after weeks of unrest over a disputed election that he had claimed to win.

He made the move Sunday hours after the Organization of American States called for a new a presidential election, citing irregularities in the Oct. 20 vote.

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4:45 p.m.

The head of Bolivia's Supreme Electoral Tribunal has resigned after an audit of the Oct. 20 presidential election concluded there were irregularities in the vote.

The tribunal president, María Eugenia Choque, announced her resignation on Sunday.

A preliminary report by the Organization of American States found a "heap of observed irregularities" in the presidential contest and said a new vote should be held.

The attorney general's office in Bolivia then said it would investigate the judges on the electoral tribunal.