Since Monday, Mexico has accused Bolivia's government of ramping up the police presence outside the Mexican embassy in La Paz and of intimidating its diplomats.

Relations between Bolivia and Mexico have been strained since Mexico granted asylum to former Bolivian President Evo Morales after he resigned Nov. 10.

The departure of Morales, who was part of a wave of leftists who dominated Latin America's politics at the start of the century, followed weeks of violent protests over allegations of fraud in the Oct. 20 election.