PITTSBURGH (AP) - Pittsburgh police say they're using uniformed and plainclothes officers and "extreme caution" to safeguard police and the public at an activists march on Friday.

The march opening the People's Convention at the city's convention center is billed as protesting "growing inequality and a toxic atmosphere of hate." Organizers expect 1,500 activists to march through downtown protesting what they believe are various social ills.

Pittsburgh's Public Safety Department is working with the FBI and other law enforcement in the wake of sniper shootings that killed five police officers and wounded seven others at a protest march in Dallas on Thursday.

Pittsburgh Bishop David Zubik also planned a noon Mass to pray for "peace and reconciliation."

And Philadelphia Archbishop Charles Chaput (SHAP'-yoo) says the Dallas murders "only discredit" such protesters' "legitimate anger."

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