Frank James, who was a person of interest in the mass shooting at a Brooklyn subway, has been upgraded to a suspect by the New York City Police, Mayor Eric Adams said Wednesday. Authorities are still hunting for the gunman who opened fire at the train, injuring at least 10 people. 

Authorities have announced a $50,000 reward for information leading to James’ whereabouts.

Also read: Brooklyn subway shooting puts spotlight on New York City’s gun culture

“At this time, based on the preliminary investigation, we believe he was alone,” New York City Mayor Eric Adams told ABC News. 

NYPD on Wednesday released a renews call to track down the suspect . 

“On 4/12/22 at 8:30 AM, Frank Robert James fired numerous gun shots inside an ‘N’ line subway car at 36th St & 4th Ave subway station causing serious injuries to 10 people,” NYPDnews tweeted.

“Anyone with info about the incident or his whereabouts should contact @NYPDTips or call 1-800-577-TIPS.”

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The police now have probable cause to arrest James for the attempted murder of 10 people, law enforcement sources told ABC News. 

“Again, Frank James is a suspect in yesterday’s shooting,” tweeted Fabien Levy, the mayor’s press secretary.

“Let me make clear: He is NOT in NYPD custody at this time.”

Authorities examined social media videos for more than 18 hours and interviewed witnesses. James is now considered a wanted fugitive and federal and local agencies, including the United States Marshals Service have joined the search for James. 

Also read: ‘No more’: New York politicians react to Brooklyn subway shooting

“This nation was born in violence, it’s kept alive by violence or the threat thereof and it’s going to die a violent death. There’s nothing going to stop that,” James said in one video.

Police Commissioner Keechant Sewell called the posts “concerning” and officials tightened security for Adams, who was already isolating following a positive COVID-19 test Sunday.

Adams said Wednesday that investigators were zeroed in on finding James.

“We are going to continue to close the loop around him and bring him in, and continue the investigation into this horrific act against innocent New Yorkers,” the Democrat said on MSNBC.