CHICAGO — A woman is being questioned after a 3-year-old boy fell off Navy Pier into Lake Michigan.

Details remain limited, but Chicago fire told WGN News the boy was removed from the water in the 700 block of E. Grand around 1 p.m. Monday, and arrived at Lurie Children’s Hospital in ‘very critical condition.’

Several divers entered the water to find the boy. First responders at the scene were able to detect the child’s pulse.

According to police, the boy was with an adult when he fell into the water. Police also confirmed to WGN News that investigators are questioning a woman in the case. No charges have been filed.

A police source told WGN Investigates that Navy Pier surveillance video appeared to show the woman pushing the boy into the water. Police have not specified the relationship between the boy and woman.

“It’s very early in this investigation,” said CPD Deputy Chief Gabriella Shemash. “Area 3 detectives are reviewing everything and exploring all circumstances.”