HACIENDA HEIGHTS — A crash involving a half-dozen cars, including a Los Angeles police car, sent four people to the hospital and prompted the closure of several lanes of the westbound 60 just east of Hacienda Boulevard early Thursday.

The crash took place just after 9:30 a.m., according to California Highway Patrol logs. In addition to the carpool and two left lanes, the westbound 60 Freeway offramp to Hacienda Boulevard was also shut down for more than an hour after the collision.

The cause of the crash remained under investigation, however involved were an unmarked LAPD Ford Crown Victoria, a flatbed tow truck, a Chrysler PT Cruiser, a Chevrolet Silverado pickup truck, a Toyota Sienna minivan and a Toyota Solara sedan, CHP officer Eduardo Martinez said.

The PT Cruiser was wedged beneath the tow truck, he said. A woman inside of it was taken to a trauma center as a precaution, however her injuries did not appear severe, the officer said.

Two men and a woman who were inside the Silverado were also hospitalized with apparently minor injuries, Martinez said. No other injuries were reported.

Two other minor two-car crashes occurred in the same area as a result of the aftermath of the first crash, but neither involved injuries, officials said. One of the drivers involved in one of the secondary crashes fled the scene of the minor collision.