Officials say pre-election violence has flared up in a crowded Haitian slum and resulted in the killings of least 15 people, including two pregnant women.

Precise numbers of the dead around sprawling Cite Soleil were hard to pin down. Spokespeople with the Haitian National Police and the U.N. mission did not immediately provide specifics Monday.

Esau Bouchard is a mayor in Cite Soleil. He says 10 people have been killed within the district's boundaries over the last few days and another eight or nine people have been slain on the outskirts.

Neighborhood organizers within the slum say most of the killings were politically motivated and done by politically aligned gangs. Bouchard says gangsters were also killed in shootouts with police.

The violence comes days ahead of presidential elections on Sunday.