ISTANBUL (AP) — Riot police in Istanbul fired water cannons and tear gas Monday to disperse pockets of protesters on the sidelines of a demonstration called by labor groups who hope to capitalize on weeks of initially small-scale activism to register broader discontent.

The demonstrations were the latest challenge to the Islamic-rooted, conservative government of Prime Minister Recep Tayyip Erdogan, who has drawn scorn abroad for his tactics against peaceful activists in two weeks of protests and exposed fault lines in Turkey’s democracy.

Riot police target Istanbul protesters