Police in New York have appealed for help to identify a man who shot at least two homeless people, killing one as the victim slept on the street.
The attacker first shot a man, 38, in the US city's Lower Manhattan area early on Saturday, wounding him, investigators said.
Then shortly before 5pm, another man was found dead in a sleeping bag with gunshot wounds in his head and neck.
"The cases are clear and horrific," said Mayor Eric Adams, a former police officer, who urged witnesses to come forward.
Video surveillance footage captured that attack, showing the shooter firing at the second man as he slept at about 6am, shortly after the first incident.
On Sunday night, local media reported an attack on a third man, who also appeared to be homeless. He was found dead at around 7pm local time with a "possible gunshot wound," NBC New York reported, citing police.
Mr Adams described the shootings as senseless attacks on people "sleeping on the streets — not committing a crime, but sleeping on the streets."
He and the police urged New York's thousands of homeless people to contact city agencies that can help them find sleeping accommodation.
Homeless people moved out of subways
New York's homeless population has grown in recent years. Mr Adams announced a plan only weeks after taking office in January to move them out of the city's vast system of subway tunnels, where many sleep on cold nights.
His proposal drew sharp criticism from some non-governmental organisations.
"People only stay in the subway because they have no better place to go," said the Coalition for the Homeless.
The appeal comes after a stabbing at New York's Museum of Modern Art on Saturday, when a man leapt over a reception desk and stabbed two employees as they tried to flee.
Scenes from New York museum stabbing — in pictures
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A police officer stands behind a curtain inside New York's Museum of Modern Art after two of its employees were stabbed. Reuters -
Medical teams arrive after the stabbing incident. AP -
A police officer stands guard after Moma was evacuated following the stabbings. AFP -
A New York Police Department officer closes the entrance of the museum. AFP -
An officer on guard. AFP -
Police said the man accused of the stabbing had been denied entrance to the museum. AFP -
The museum is evacuated after the attack. Police said both victims were in a stable condition at Bellevue Hospital. AP -
An investigator at the museum. AFP -
Police officers guard the entrance to the museum. Reuters -
Police in the museum lobby, where two employees were stabbed. Reuters -
A crowd gathers outside at the Museum of Modern Art in New York after a man stabbed two employees AP
