According to reports, citizens occupied an area in Villa El Salvador, an urban, largely residential coastal district on the outskirts of Lima.
Dozens of officers were deployed to remove alleged squatters from the area, who claim the land had been untouched for 65 years.
Residents threw stones at police, who used tear gas to disperse the crowd.
General Commander of Police, Augusto Cervantes Cardenas, said 11 people were arrested after resisting eviction, and four officers were wounded during the clashes.
A heavy police presence remained in the area to prevent residents from returning.