VALENCIA, Spain (AP) — Tens of thousands of Spaniards marched in the eastern city of Valencia on Saturday to demand the resignation of the regional president in charge of the emergency response to last week’s catastrophic floods that left more than 200 dead and others missing. A group of protestors clashed with riot police in front of Valencia’s city hall, where the protestors started their march to the seat of the regional government. Police used batons to beat them back.

Regional leader Carlos Mazón is under immense pressure after his administration failed to issue flood alerts to citizens’ cellphones until on the night of Oct. 29. Many marchers held up homemade signs or chanted “Mazón Resign!” Others carried signs with messages like “You Killed Us!” Upon arrival at the regional government seat, some protesters slung mud on the building and left handprints of the muck on its facade.

Earlier on Saturday, Mazón told regional broadcaster À Punt that “there will be time to hold officials accountable,” but that now “is time to keep cleaning our streets, helping people and rebuilding.” He said that he “respected” the march. Mazón, of the conservative Popular Party, is also being criticized for what people perceive as the slow and chaotic response to the natural disaster.

Thousands of volunteers were the in many of the hardest hit areas on Valencia’s southern outskirts. It took days for officials to mobilize the thousands of police reinforce.