PROVIDENCE, R.I. (WPRI) — All lanes of I-95 South have reopened after a tractor-trailer crash snarled the morning commute on Wednesday.

The jack-knifed truck blocked all travel lanes in the area of Exit 22 in Providence, shutting down the highway for about two hours.

“The tractor-trailer first struck a vehicle in the rear, then sideswiped another vehicle before veering to the left and striking the high-speed barrier,” R.I. State Police said in a news release. “The tractor trailer then travelled towards the right, struck two additional vehicles and the right barrier before coming to rest across all lanes of travel.”

The truck and the four other vehicles involved in the crash were towed from the scene, according to police.

Four people were taken to Rhode Island Hospital complaining of pain.

The cause of the crash is under investigation.