ISTANBUL — The Turkish government said on Friday that it was preparing to take over at least 28 municipal administrations nationwide, ousting elected mayors as part of an intensified crackdown against Kurdish insurgents.

The government is accusing the mayors of supporting and funding militants from the Kurdistan Workers’ Party, or P.K.K., an outlawed group that has been engaged in a violent autonomy struggle for more than 40 years.

“The administration of 28 municipalities will no longer be in the hands of terrorists,” Suleyman Soylu, the interior minister, said in a televised speech.