PHOTOS: Here’s what it looked like when a subway train derailed in New York City

A subway train in New York City derailed and crashed into a wall Tuesday morning, leaving more than 30 people with injuries and causing massive transit delays throughout the city.

The train derailed between the 135th Street and 125th Street stations in the Harlem neighborhood of Manhattan, the Metropolitan Transit Authority confirmed. According to one MTA official, the crash was caused by an abrupt triggering of the train’s emergency brake, DNA Info reported. The agency is investigating why the brake was activated.

Several passengers aboard the train documented the aftermath of the accident. According to one account, firefighters and subway employees helped evacuate passengers through the window of one of the train cars.

The derailment is one of several recent incidents that have plagued the city’s overburdened subway system.

Here are some photos of the incident:

The force from the derailment was so strong that it tore a metal door off one of the subway cars.

Passengers were stuck on the train as the cars filled up with smoke. Eventually they were evacuated through the front car of the train.

The crash caused the train to lose power, leaving passengers in the dark.

Firefighters and MTA employees led passengers to safety through the subway tunnel.

The incident caused major transit delays throughout the city. One passenger on a different line said he was stuck for more than an hour.

Meanwhile, above ground, emergency service personnel worked outside the station in Harlem.

More than 30 people were hurt in the accident.

Hours after the crash, service at some stations has yet to resume.