A Bronx pedestrian was run down by the driver of a heavy New York City Sanitation truck early on Tuesday — and the driver kept on going, police said.

The pedestrian, whose name was not immediately released, was crossing Willis Avenue at E. 138th Street at about 6:35 a.m. when she was struck and killed by the 2007 sand spreader, cops said. The NYPD Highway District’s Collision Investigation Squad said the driver fled after the cash. The Daily News reported that a witness saw the driver briefly stop before fleeing.

Police said no one has been arrested but the Daily News reported that the driver was collared.

It is unclear where the sand truck was heading, but there is a Sanitation facility a few blocks away on E. 132nd St.

The Department of Sanitation did not respond to an immediate request for comment. Last year, a DSNY driver hit and killed a pedestrian in Crown Heights. The agency later moved to fire him.

Update (Tuesday, 5:34 p.m.): The driver was on-duty and had been assigned to put salt on the roads ahead of anticipated wintry weather, according Sanitation department spokesperson Dina Mossi. The driver has been suspended, the agency is cooperating with police and an internal investigation is also underway.

This is a breaking story. Check back for updates.