New York, Dec 27 (AP) The man accused of burning a woman to death inside a New York City subway train has been indicted on state charges, a prosecutor said on Friday.

The development comes days after Sebastian Zapeta's arrest and subsequent police questioning, in which authorities say he claimed not to know what had happened although he identified himself in photos and surveillance video showing the fire being lit.

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Zapeta's indictment will be unsealed on January 7, according to prosecutors. He remains jailed at the city's Rikers Island complex.

The harrowing episode Sunday morning on a stopped F train at Brooklyn's Coney Island station has renewed concerns about safety in the nation's largest mass transit system.

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Zapeta, 33, who federal immigration officials said is a Guatemalan citizen who entered the US illegally, was initially charged in a criminal complaint with murder and arson.

Such filings are often a first step in the criminal process because, in New York, all felony cases require a grand jury indictment to proceed to trial unless a defendant waives that requirement.

Authorities say Zapeta approached the woman, who might have been sleeping on the train, at the Coney Island station stop, and set her clothing on fire with a lighter. He waved a shirt at her to fan the fire, causing her to become engulfed in flames, prosecutor Ari Rottenberg said during the court appearance Tuesday.

Zapeta then sat on a bench on the platform and watched as she burned, prosecutors allege. The woman was pronounced dead at the scene.

Police took Zapeta into custody while he was riding a train on the same line later that day.

Zapeta told investigators that he drinks a lot of liquor and did not know what had happened, according to Rottenberg. However, Zapeta did identify himself in photos and surveillance video showing the fire being lit, the prosecutor said.

A Brooklyn address for Zapeta released by police after his arrest matches a shelter that provides housing and substance abuse support.

Federal immigration officials said he was deported in 2018 but returned to the US illegally sometime after that. (AP)

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