HAZLE TWP., Pa. (CBS) – Officials are investigated what caused a tractor trailer and a school bus to collided in Luzerne County, Pennsylvania.

The incident occurred around 10:50 a.m. Friday along Interstate 81 in Hazle Township.

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Officials say first responders are on scene and a landing zone is being established for a medical helicopter.

Hazleton Hospital officials say they received 18 children with mostly bumps and bruises or as a precaution.

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The southbound lanes of I-81 have been closed.

Stay with CBSPhilly.com for the latest on this developing story.

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