NEW YORK (AP) — New York police have arrested a man on murder and arson charges after a woman was set on fire on a subway train early Sunday morning.

Sebastian Zapeta, 33, was arrested Monday after being taken into custody the day before. It is unclear whether Zapeta has an attorney or when he will be charged. Immigration officials say Zapeta, a Guatemalan native, had been deported before and was not authorized to remain in the United States

Police said surveillance video showed a man calmly approaching the as-yet-unidentified woman on a stationary F train at the Coney Island-Stillwell Avenue station in Brooklyn and then setting her on fire.

Her clothing “was completely devoured within seconds,” said New York Police Commissioner Jessica Tisch, describing the case as “one of the most depraved crimes that one person could ever commit against another human being.”

The man then sat on a bench near the train car and watched as officers and a public transit worker extinguished the flames, police said.

Here’s what we know:

What’s the latest?

Zapeta was taken into custody hours after police distributed images of a suspect in the woman’s death. According to police, three high school students called 911 after recognizing the person in the picture, and officers found him on a different subway train, wearing the same gray hoodie, the same wool hat, the same paint-spattered one Pants and the same brown boots.

U.S. Immigration and Customs Enforcement spokesman Jeff Carter said Zapeta is a Guatemalan citizen who entered the U.S. illegally after previously being deported to Guatemala in 2018.

It is unclear when and where he re-entered the United States, Carter said.

An address released by police for Zapeta in Brooklyn matches a service center for Samaritan Daytop Village, which provides housing and substance abuse support. The organization did not immediately respond to a request for comment.

Brooklyn District Attorney Eric Gonzalez released a statement saying, “We will do everything in our power to ensure accountability in this case.”

What police presence is there on the subway?

Police patrol New York City’s subways, and there is a vast network of cameras in stations and all subway cars.

But the sheer size of the subway system — 472 stations with multiple entry points and millions of riders per day — makes monitoring a logistical nightmare.

On Sunday, officers were at the station but patrolling a different subway platform. They responded after seeing and smelling smoke from the fire.

New York Gov. Kathy Hochul earlier this year directed members of the state’s National Guard to assist with random bag checks at designated stations.

Is crime high in the subways?

Violent incidents on the subway often unsettle people, in part because many New Yorkers ride the train several times a day and often have their own experiences with unpleasant interactions in the system.

Broadly speaking, urban transit crime has declined this year compared to the same period in 2023. Data compiled by the Metropolitan Transportation Authority shows a 6% decline in what the agency describes as serious crimes between January and November of this year and 2023.

At the same time, the number of murders in the transit system has increased, with nine killings this year through November, compared to five in the same period last year.

High-profile train incidents, such as the case of Daniel Penny, a military veteran who choked an agitated New York City subway rider and was acquitted of murder this month, often draw national attention and further unnerve passengers.