A boy and a woman in her 50s were in critical condition yesterday after an out-of-control vehicle crashed into a freeway retaining wall off Kapalama Avenue.

The vehicle drove through a fence near the bend in Kapalama Avenue and continued across a vacant lot before crashing into a concrete wall along H-1 freeway at 2:48 p.m., said Honolulu fire Capt. Terry Seelig. The vehicle came to rest on its side, he said.

When firefighters arrived a boy, who apparently was in the vehicle, was already taken out by bystanders, Seelig said.

Firefighters used webbing to anchor the vehicle and cut the woman out with a hydraulic tool, removing her by 3:25 p.m., Seelig said.

The boy, who was under the age of 5, was taken in critical condition to the hospital, said Honolulu Emergency Services Department spokesman Bryan Cheplic. The woman was taken to the hospital in serious condition, but her condition worsened to critical, Cheplic said.

Honolulu police are at the scene investigating the crash.