Pittsburgh's Labor Day Parade, one of the nation's largest, returns on Monday to honor and recognize the American labor movement.

The day will begin with the traditional Labor Day Mass at 8:00 a.m. at St. Benedict the Moor Church. After the Mass, local unions will gather in the parking lots around PPG Paints Arena and begin lining up for the parade.

Honoring the Clairton plant explosion victims

At 10:00 a.m., following ceremonial sirens from the Pittsburgh firefighters, parade-goers will observe a moment of silence in honor of those who were killed in the U.S. Steel Clairton plant explosion in mid-August.

Two were killed and 10 were injured in the explosion earlier this month. The explosions sent black smoke billowing into the air that could be seen for miles.

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