A 73-year-old woman was critically injured and three others were hurt in a crash on H-1 that shut down both sides of the freeway near Halawa this afternoon.

Honolulu Emergency Medical Services officials said personnel responded to a two-vehicle crash at about 2:40 p.m. on the westbound lanes of H-1 freeway. EMS crews treated four patients — a woman and three males.

The woman had “multiple traumatic injuries” and was taken to a hospital in critical condition and a 33-year-old man was treated and transported to a hospital in serious condition, EMS said.

Two juvenile males were treated at the scene and declined EMS transport.

Police said the woman had to be extricated by the Honolulu Fire Department.

The Honolulu Police Department’s Traffic Division said the crash involved a passenger van and a large box truck containing multiple propane tanks.

The 33-year-old driver of the box truck and his two male passengers, ages 33 and 24, were traveling west on H-1 when the truck’s roll-up door opened, police said. The truck driver stopped to secure the door and the vehicle was rear-ended by the van driven by the 73-year-old woman, who was also heading west.

The truck driver’s condition was later upgraded to good from serious.

Neither speed, drugs nor alcohol appear to be factors in the collision, police said.

Both sides of the freeway were closed “near the Aiea off-ramp (exit 13) due to a vehicle collision and spilled load,” according to the state Department of Transportation.

East-bound lanes were opened at about 4 p.m., and the westbound lanes reopened around 5 p.m., according to DOT. The closure caused gridlock in surrounding areas as police diverted traffic from the freeway.