Mayor Rahm Emanuel, under fire for months over how the city investigates excessive force allegations against Chicago police, plans to propose abolishing the city's beleaguered Independent Police Review Authority.

The city would replace the agency — known for sluggish investigations that rarely led to discipline — with a civilian agency "that has more independence and more resources to do its work," Emanuel wrote in an essay released Friday. The essay offered few specifics about the new agency, though the mayor wrote that the details will be worked out in the coming weeks and presented at a City Council meeting June 22.