STATEN ISLAND, N.Y. -- Witnesses say a student's arm was stuck in the door of a moving bus and the driver refused to pull over on Friday.

A photo of the incident went viral on Facebook, and several bus riders contacted the MTA about the incident.

"The safety of our customers is our first priority. These allegations are deeply concerning, and they are under investigation," said an MTA spokesman.

The social media post features a young girl standing by the front of the bus, with her arm between the two doors, hanging out of the bus.

Witnesses claim the girl and her friends were trying to catch the S46 bus in front of I.S. 61, but only she got on. After asking the bus driver to wait for her friends, the driver closed the door on the girl's arm, according to riders on the bus who spoke to the Advance.

A photo of the incident went viral on Facebook, reaching over 1,000 shares just a few hours after it was posted.

Paul Costello, who posted the photo, says he did it to make other bus riders more aware of the incident.

"I posted it to Facebook because I knew I'd be guaranteed a response," said Costello, who said he was on his way home from work around 5:20 p.m., when he heard the bus full of people screaming.

"'Stop the bus,' 'Her arms stuck,' 'Stop laughing,' everyone was screaming," said Costello. "I got up to see what the commotion was and that's when I saw the girl's arm stuck in the door. Even with everyone screaming, the driver did nothing."

Costello's post states this went on for close to four blocks.

"By the time people were able to react and try to help her, the door had been opened," said Costello.

He said he obtained the photo from another passenger, so he could later use it and report the incident to the MTA. Costello filed a complaint with the MTA and received a response that they would investigate the incident.

Shalaysha Johnson, another witness on the bus, said the incident made her get out of her seat and "start yelling that the girl's arm was stuck in door."

"But the driver ignored me," said Johnson.

She said it wasn't until passengers had their phones out, and started taking pictures that the driver pulled over and opened the doors.

"She [the driver] started yelling back at us to shut up, and that she didn't see the girl's hand was stuck," said Johnson. "She told us all to mind our business, too."

The Advance was unable to reach the student's family for comment.