Dhaka, Sept. 22 -- Thousands of protesters took to the streets in the Philippine capital on Sunday to express their outrage over a corruption scandal involving lawmakers, officials and businesspeople who allegedly pocketed huge kickbacks from flood-control projects in the poverty-stricken and storm-prone Southeast Asian country.

Police forces and troops were put on alert to prevent any outbreak of violence.

Thousands of police officers were deployed to secure separate protests in a historic Manila park and near a democracy monument along the main EDSA highway, also in the capital region, where organizers hoped to draw one of the largest turnouts of anti-corruption protesters in the country in recent years.

The United States and Austral...