The driver of a truck that hit a woman and her 4-year-old son on the Upper West Side yesterday is apparently still on the loose.

Wendy Ruther was crossing 65th Street at Broadway with her son, Justin, when the two were hit by the driver of a truck just after 9 a.m., an FDNY spokesperson said.

Though her child is expected to recover, Ruther is at NewYork-Presbyterian in serious condition. Justin's father, Aldo Lombardi, told NY1 that the driver ran Ruther over with three tires but sped off without stopping. Cameras positioned at the intersection apparently did not capture the incident.

"We're asking for help," Lombardi told the station. "If anybody has seen any of this accident or has any piece of information, it will be really helpful because as of right now, nobody has come forward."