MOTT HAVEN, the Bronx (PIX11) — A man was fatally stabbed in the chest aboard an MTA bus Sunday night in Mott Haven, according to police, marking one of at least three assaults in New York City’s transit system in a matter of hours.

Lamont Barkley, 55, was riding the BX19 bus near East 149th Street and Gerard Avenue at around 8:25 p.m. when he got into a fight with a man and a woman, police said. The dispute then escalated and the man was stabbed.

Barkley was taken to an area hospital by first responders, but he could not be saved.

By the time police arrived, the assailants had fled the bus on foot. No arrests had been made as of early Monday.

Meanwhile early Monday, police were investigating another two attacks in the transit system, this time in Manhattan. In the first incident, 49-year-old woman waiting for the northbound No. 2 train at the Central Park North – 110th Street station in Harlem was struck in the head by an unknown object around 2:25 a.m. in what authorities called an unprovoked attack.

The suspect, described by investigators as a man in his 20s with a slim build, had fled by the time police arrived at the scene. The victim was taken to an area hospital. While her exact condition was not specified by officials, she was expected to survive her injuries.

Then, a man was stabbed in the leg aboard a southbound Q train near the Eighth Street – New York University station in Greenwich Village around 4:30 a.m., police said. The victim was taken to an area hospital in what officials described as stable condition. A suspect was taken into custody at the scene, but authorities did not immediately release their name or detail charges against them.

Sunday night’s fatal bus stabbing was just the latest in a recent string of assaults in the city’s transit system, including two other deadly attacks.

On Thursday, Charles Moore, 38, was stabbed to death as he was exiting a No. 4 train at the 176th Street station in the Morris Heights section of the Bronx, in what authorities have called an unprovoked attack. A suspect in the slaying, 27-year-old Saquan Lemons, has been arrested and charged with murder, manslaughter, and criminal possession of a weapon.

And late last month, Tommy Bailey, 43, was slashed across the neck and killed in an argument aboard an L train rumbling through Brooklyn, according to police. Suspect Alvin Charles, 43, has been charged with murder in that case.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting crimestoppers.nypdonline.org, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).