Several weapons and a large volume of crystal meth were seized following the operation against Ozamis Mayor Reynaldo Parojinog, Xinhua news agency reported.
An official said Parojinog's daughter Nova Princess, the city's Vice Mayor, was arrested at the family's estate in San Roque Lawis village.
Parojinog's wife Susan and Octavio Parojinog Jr, a member of the provincial legislative board, were among those killed.
The Parojinogs were among powerful warlord clans whom President Rodrigo Duterte has named as biggest narco-politicians in violence-plagued Philippines.
Duterte had publicly named and threatened the family for their alleged involvement in drugs trade, kidnapping and other crimes.
The family was also tagged as the founder of Kuratong Baleleng, a gang of former military men who were into kidnapping and bank robberies in the 1980s.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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