A Southwest Airlines flight from Chicago to Newark, New Jersey, made an emergency landing in Cleveland on Wednesday because of a broken window, the airline has confirmed.

The plane took off at 9:53 a.m. ET and made the emergency landing at 10:46 a.m., according to the flight-tracking website FlightAware.

People on Twitter posted photos of the broken window after the incident.

Southwest told Business Insider the broken window was not the result of an engine failure.

A Southwest Airlines flight from Chicago to Newark, New Jersey, made an emergency landing in Cleveland on Wednesday because of a cracked window, the airline has confirmed to Business Insider.

The flight took off at 9:53 a.m. ET and made the emergency landing at 10:46 a.m., according to the flight-tracking website FlightAware.

According to FlightAware, the plane is a Boeing 737-700, the same model of the flight that made an emergency landing in Philadelphia last month after an engine failure that sent debris through the cabin. One passenger died in that incident after being partially sucked out of a window.

Southwest told Business Insider on Wednesday that the plane that landed in Cleveland maintained pressurization throughout the flight and that the broken window was not the result of an engine failure.

"The crew of Southwest Flight 957, with scheduled service from Chicago-Midway to Newark, made the decision to divert the plane to Cleveland for maintenance review of one of the multiple layers of a window pane," the airline said. "The flight landed uneventfully in Cleveland. The aircraft has been taken out of service for maintenance review, and our local Cleveland employees are working diligently to accommodate the 76 customers on a new aircraft to Newark."

The airline has not released details about what might have cracked the window. The Federal Aviation Administration told Business Insider it would investigate the incident.

Boeing declined to comment.

Alejandro Aguina posted a photo on Twitter of the broken window, saying the crack was on the outside.

"On my way to NJ for work and #Southwest957 gets a window crack," Aguina wrote. "Only outside crack so we're all safe. On our way to NJ in new plane. Thanks to the @SouthwestAir crew and pilots for handling it professionally."

Ryan Holley, who said his mother was on the flight, also posted a photo of the window.

"@SouthwestAir has a serious problem with their fleet," Holley tweeted. "My moms plane just had to divert and land in #Cleveland cuz of another window crack."

Another person on Twitter posted a video of passengers deboarding the aircraft.

The incident on Wednesday comes at a difficult time for Southwest. Last week, the airline said it had seen a decline in bookings since the fatal accident in April.

Robert Sumwalt, the chairman of the National Transportation Safety Board, said that passenger's death was the first in a US passenger airline accident in over nine years. Before that, the most recent was in February 2009 when an aircraft operated by the now defunct regional airline Colgan Air crashed near Buffalo, New York, leaving 49 people on the plane and one person on the ground dead.

The NTSB has said a full investigation of the April 17 flight will take at least a year. The agency says it does not plan to investigate the emergency landing on Wednesday.

On Tuesday, the FAA said it ordered new inspections of fan blades in aircraft similar to the ones used by Southwest.

This story is developing. Check back for updates.