[UPDATE BELOW] At least a dozen people were injured after two buses collided in the Lincoln Tunnel this morning.

The crash occurred when a New Jersey Transit bus collided with a private bus in the tunnel's Manhattan-bound side around 10 a.m. The lane was shut down, and delays are reportedly around 30 minutes.

Update, 12:30 p.m. CBS reports that at least 31 people were injured in the crash.

The private bus was apparently carrying a group of 8th grade students visiting the city from Toronto. The incident was caused when a New Jersey Transit bus carrying around 60 passengers rear-ended the private bus.

Port Authority announced during a news conference that of those injured, four were hospitalized with serious neck and back injuries. The Fire Department said that none of the injuries are life-threatening.

None of the students were injured.