The Philippines has a long tradition of political violence - fuelled by lax gun laws, politicians with private armies and corrupt law enforcement agencies - and dozens of people are killed each election campaign.
In the latest incident, unknown gunmen broke into the home of politician Armando Ceballos in a mountainous town in the southern Philippines at dawn today and shot him dead, a provincial police spokesman said.
"The killers wore bonnets... As of now we are treating this as an election-related case," the spokesman, Chief Superintendent Surki Serenas, told AFP by telephone.
In the far southwestern island of Puerto Princesa, gateway to some of the Philippines' most popular holiday destinations, two supporters of the local mayor were stabbed to death at a campaign sortie late on Thursday, police said.
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The two men were part of a motorbike convoy in support of Puerto Princesa city mayor Lucilo Bayron, who is stumping to retain his seat, police investigator Earl Torres told AFP today.
The attackers were not identified, though the Bayron camp blamed supporters of his rival.
In the country's deadliest single incident of political violence on record, 58 people were massacred in 2009 as gunmen allegedly belonging to a local warlord in the southern Philippines attacked a group of people to stop a rival filing his election candidacy.
Thirty-two of the victims were journalists covering the contest, making the attack the deadliest ever recorded against media professionals. Twenty-eight members of the Ampatuan clan accused of orchestrating the killings are on trial for the massacre, but one of them is running for mayor in the family's home territory after the trial court allowed him to post bail.