The clampdown indicated authorities were taking a hardline against attempts to rekindle the protests.
In Istanbul, police battled protesters in side streets off Gezi Park and beyond.
In Ankara, the capital, police dispersed hundreds who tried to hold a memorial service for an activist who died of injuries sustained in a nearby police crackdown nearby on June 1.
Police sweep
A police sweep had already ended a more than two-week sit-in by activists in Gezi Park which began as a protest over plans for its redevelopment.