Police killed Ozamiz City Mayor Reynaldo "Aldong" Parojinog Sr. and 11 others, including his wife and his brother who is an incumbent provincial board member, in a series of raids conducted on the houses and other properties of the influential political clan in Misamis Occidental before dawn Sunday.
De Guzman confirmed that Mayor Parojinog, his wife Susan, and his brother Octavio were among the fatalities.
Firearms and methamphetamines were recovered from the houses, media reports said.
According to police, the officers were met with a "volley of fire" from the family's security personnel, prompting police to retaliate.
Parojinog's daughter, Vice Mayor Nova Echaves, was arrested.
Presidential Spokesperson Ernesto C. Abella, in a statement yesterday, reiterated this, saying: "The Administration vowed to intensify the drug campaign".
Gonda said four members of the Barangay Peacekeeping Action Team (BPAT) who were guarding the house of Vice Mayor Parojinog allegedly resisted the police raiders and were also killed.
Police said none of their officers was hurt apart from one who sustained a minor injury from an explosion.
In November, Rolando Espinosa Sr, the jailed mayor of Albuera, Leyte, was killed during a nighttime raid on his cell.
Confiscated from the mayor's home were $27,000 in cash, three rifle grenades, bags of suspected illegal drug shabu and a firearm, the Mindanaoan Broadcasting Channel told CNN Philippines.
Duterte won the presidency a year ago after promising to kill tens of thousands of criminals to prevent the Philippines from becoming a narco-state.
When he was running for president, Duterte vowed to relentlessly crack down on the drug trade in the Philippines, telling voters "forget the law on human rights" and warning drug pushers and "do-nothings" he would not hesitate to kill them.
A pool of blood surrounds the bodies of 3 men killed in a police raid against the Parojinogs.
Duterte said he would be "happy to slaughter" three million drug addicts, and likened his campaign to Nazi leader Adolf Hitler's efforts to exterminate Jews in Europe. It has killed thousands of suspected drug users and dealers. "That can not be; they should be afraid of people who do good for all".
According to human rights groups, Philippine security forces and "unidentified gunmen" have killed nearly 8,000 Filipino drugs suspects, the largest number of civilian deaths in South-east Asia since the Khmer Rouge genocide in Cambodia in the 1970s.
McGovern also said that someone with Duterte's abysmal human rights record should not be invited to the United States. "No jury. Simply, murder", Rep. Jim McGovern (D-Mass.) said during a recent hearing in Congress on Duterte's drug war.