The New York Police Department has identified a person of interest over the Brooklyn subway mass shooting.
An image of 62-year-old Frank James has been shared by the NYPD in the hope he can be found and questioned.
NYPD Chief of Detectives James Essig said: "We are looking to determine if he has any connection to the train.
"We know Mr James rented that U-Haul truck in Philadelphia."
A U-Haul key was found at the site of the shooting and the rental vehicle was located just five miles from the crime scene.
Authorities were alerted to James' identity after he allegedly made 'concerning' social media posts.
NYPD chief Keechant Sewell said: "We still do not know the suspect's motivation."
The posts were related to homelessness in New York City and also targeted New York City mayor Eric Adams.
Adams' spokesperson Fabien Levy said the NYPD will be increasing his security detail 'until this man has been questioned'.
Police are offering a $50,000 reward for information that leads to Frank James' arrest.
Authorities have recovered a 9mm semi automatic handgun from the crime scene, along with 'extended magazines, a hatchet, gasoline, consumer-grade fireworks and a hobby fuse', according to the Daily Mail.
As the train approached Brooklyn's 36th Street station at 8.30am local time Tuesday, 12 April, smoke started filling in one of the cabins.
A man described as being 165cm tall 'with a heavy build' reportedly opened a gas canister, which caused havoc inside as people panicked.
The suspect was wearing 'a green construction vest and a grey hooded sweatshirt' and he put on a gas mask to allow him to breathe easily among the chaos.
He then pulled out a weapon and started shooting at people indiscriminately as they clambered to get out of the train.
NYPD Commissioner Keechant Sewell says the gunman shot at people inside the carriage and also on the subway platform, which left trails of blood everywhere.
Twenty-nine people have been injured in the mass shooting, according to CNN.
Ten were shot, with five of those victims in critical but stable conditions, according to FDNY First Deputy Commissioner Laura Kavanaugh.
There were also multiple people treated for smoke inhalation and shrapnel wounds.
New York Governor Kathy Hochul said: “This individual is still on the loose. This person is dangerous.”
The FBI is now collaborating with the NYPD and they said they will be following 'every viable lead'.
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