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Philippine police say a detained town mayor has been killed in his jail cell in a purported gunbattle with officers in the second killing in a week of a politician linked to illegal drugs under the president's brutal crackdown.

Police say Mayor Rolando Espinosa Sr. of Albuera town in central Leyte province and a fellow inmate were shot dead before dawn Saturday after they fired at officers who staged a raid in search of firearms and illegal drugs.

Last week, police killed another town mayor, Samsudin Dimaukom, and nine of his men allegedly in a gunbattle in the southern Philippines.

Espinosa and Dimaukom were among more than 160 officials named publicly by Duterte in August as part of a shame campaign.