A multi-vehicle crash involving a tractor trailer shut down a portion of the westbound Pennsylvania Turnpike just before the Tuesday morning rush hour.

The accident occurred shortly before 6 a.m. near the Bensalem exit, leading to the closure of all lanes between the Bensalem and Willow Grove exits, turnpike officials said.

The crash resulted in injuries, the number and severity of which were not immediately known, officials said.

The turnpike's "Plan X" emergency procedure went into effect, rerouting traffic at the Bensalem interchange. According to the turnpike's website, "Plan X" is put in place for extended closures of at least an hour.

No additional information on the crash was immediately available Tuesday morning.