Police spokeswoman Ndandula Siamana said that in one Lusaka neighborhood Tuesday, voters claimed they saw a man with pre-marked ballot papers. Siamana said a crowd burned the papers, as well as a truck and a small bar. A spokesman for the Electoral Commission of Zambia said the report of pre-marked ballot papers was not confirmed.

In a second incident in Lusaka, Siamana said voters angered because a polling station opened late threw rocks and set fire to five vehicles, among them a police car.

No injuries or arrests were reported in either incident.

Zambians are choosing a president, 150 lawmakers and more than 1,000 municipal councilors.