MANILA - Tanauan Mayor Antonio Halili of Batangas was shot dead during Monday's flag raising ceremony in his city, a video shared to ABS-CBN News showed.

In the footage captured by Kirok Alcazar, gunshots supposedly from Halili's bodyguards could be heard, moments after the mayor fell to the ground.

Police said an unidentified gunman shot Halili in the chest. The mayor was declared dead on arrival at the CP Reyes Medical Center, according to Calabarzon police director Chief Supt. Edward Carranza.

Halili first gained notoriety after he made suspected drug criminals take a "Walk of Shame" around the city in 2016.

He was later included on the list of high-value drug targets of the police and subjected to "Oplan Tokhang." In 2017, he lost supervision over the police, along with other officials accused of dabbling with the narcotics trade. He denied the allegations.