PHILADELPHIA – The Philadelphia Police Department says seven officers whose Facebook posts were flagged in an investigation into offensive and sometimes threatening social media activity have resigned.

Last month, the department suspended 13 officers with an intent to fire them after a non-profit group published the results of a review of personal Facebook posts or comments from officers in Philadelphia and seven other police departments.

The researchers found officers from Arizona to Florida bashing immigrants and Muslims, promoting racist stereotypes, identifying with right-wing militia groups and glorifying police brutality. All of the posts were public.

Capt. Sekou Kinebrew tells the Philadelphia Inquirer he can’t say whether the seven who resigned were among those set to be fired.

The police officers’ union didn’t comment on the resignations.

It previously said it was disappointed the officers would “be terminated without due process.”

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Information from: The Philadelphia Inquirer, http://www.inquirer.com