MANILA, Philippines — Philippine police arrested 49 people suspected of hurling rocks, bottles and fire bombs at officers and blocking heavily guarded roads and bridges leading to the presidential palace Sunday while a peaceful anti-corruption rally took place in the capital, officials and witnesses said.

The melee outside the country’s seat of power unfolded while more than 33,000 other protesters rallied in a historic park and a democracy monument in Manila. They expressed outrage over a corruption scandal involving lawmakers, officials and construction company owners who allegedly pocketed huge kickbacks from flood-control projects in the impoverished Southeast Asian country that is regularly buffeted by storms and typhoons.

The hourslong rampage by about 100 mostly club-wielding peop

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