Police officers from across Massachusetts gather outside a suburban Boston City Hall, to protest a "Black Lives Matter" banner hanging from City Hall.

FOX's Gary Baumgarten reports:

Cops are upset, saying that "All Lives Matter" and that the banner implies cops are killers of innocent people of color.

Harold MacGilvray is with the Massachusetts Police Union:

(MacGilvray) "Mayor Curtatone, let the people decide if they want this building, their building to be a place to hang political and special interest banners."

But Somerville, Massachusetts Mayor Joseph Curtatone is adamant, the banner will stay:

(Curtatone) "We can fight to protect minorities and still praise the hard work of law enforcement officials."

Meanwhile, residents of Somerville appear divided over the banner.

Gary Baumgarten, FOX News.

Follow Gary Baumgarten on Twitter: @GaryBaumgarten

(AP Photo/Charles Krupa)
(AP Photo/Charles Krupa)