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KEW GARDENS HILLS, Queens — People were told to be on the alert after a woman was found critically injured following a “very violent” attack and possible sexual assault, officials said Monday.

The area of 72nd Road and Kissena Boulevard, bordering Kew Gardens Hills and Pomonok, is pictured. (Google Maps)

Police found the woman, 52, after responding to a 911 call about a possible sexual assault near 72nd Road and Kissena Boulevard, bordering Kew Gardens Hills and Pomonok, around 8:33 a.m., the NYPD said.

She’d just dropped her son off at school, officials said.

A neighbor found the woman unconscious at the bottom of an exterior stairwell in the area, police said. Her pants had been pulled down. The woman had trauma to her face and body, and was hospitalized in critical condition.

Sources told PIX11 the attack was “very violent.”

A family member picked the woman’s son up from school Monday afternoon. He has no idea what happened to his mom.

NYPD Chief of Detectives Dermot Shea said people living in the 107 Precinct, covering several neighborhoods in northern Queens, should be on alert.

“If you’re in the area, remain vigilant and report unusual activity,” Shea tweeted.

As of Tuesday morning, a $2,500 reward for information leading to an arrest was offered.

Investigators continue to canvass the area, seeking leads from locals and possible surveillance footage.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).