Eagan police are investigating the near-drowning of a 5-year-old boy at a swimming pool on the city’s north side.

According to police, emergency crews responded at 10:20 a.m. to the Fox Ridge Estates apartments at 3367 Coachman Road, just north of Yankee Doodle Road, regarding a possible drowning. They arrived to find a construction worker performing CPR on the boy near an outdoor swimming pool. Paramedics and firefighters took over, and the boy was later taken to Regions Hospital in St. Paul.

Construction workers nearby were alerted to the drowning by screaming from the boy’s 3-year-old sister. The workers called 911 and began CPR.

Police believe the children were home in a nearby apartment with their mother when, unknown to her, they left the unit and walked to the pool, which is surrounded by a fence and locked gate.

“It is unclear how the boy gained access to the pool, but it is believed he climbed over the fence,” officer Aaron Machtemes said in a news release. “Somehow, he entered the water and was found unconscious where he was later removed by the construction worker.”

Machtemes said police do not know how long the boy had been in the water, and his condition remains unknown.

He said the investigation is continuing.