A photo provided by the NYPD shows a motor scooter...

A photo provided by the NYPD shows a motor scooter a gunman was believed to be riding in Queens and Brooklyn on Saturday. Credit: NYPD via AP

A 25-year-old Brooklyn man responsible for what Queens District Attorney Melinda Katz called "scenes of terror" faces 25 years-to-life in prison for a Saturday morning shooting spree that saw him ride through Brooklyn and Queens on a scooter, indiscriminately firing at and wounding at least four pedestrians, including an 86-year-old man who later died.

Thomas Abreu is scheduled for arraignment Monday in Queens, charged with second-degree murder, four counts of second-degree attempted murder, two counts of first-degree assault and two counts of second-degree criminal possession of a weapon.

It was not immediately clear if he is represented by counsel.

The NYPD and prosecutors said the motive for the shootings remains unclear.

"The streets of two boroughs were turned into scenes of terror as this defendant allegedly rode his scooter, shooting indiscriminately at pedestrians and others," Katz said in a statement, thanking the NYPD for making a quick arrest in the case.

Following the arrest of Abreu Saturday, Joseph Kenny, an assistant chief with the NYPD's detective bureau, said a motive was still not known and Abreu's actions appear to be random. “ "If you look at the demographics, the pedigree, of the victims, they’re all different," he said. "At this time, video shows that he’s not targeting anybody, he’s not following anybody. As he’s driving on his scooter, he’s randomly shooting people.”

Police have determined there were six related shootings.

On Monday, the Queens District Attorney's Office said that at about 11:10 a.m. Saturday, Abreu was seen on surveillance video on Ashford Street and Arlington Avenue in Brooklyn operating his scooter and shooting a pedestrian in the back.

About 16 minutes later, officials said, Abreu was seen again, on surveillance video and by an eyewitness, approaching the 86-year-old man on 108th Street and Jamaica Avenue in Richmond Hill — and shooting that victim in the back.

The man was transported to Jamaica Hospital Medical Center, where officials said he died. The victim has been identified by police as Hamoo Saedi of Queens.

Just one minute after the shooting of Saedi, prosecutors said, NYPD officers were alerted about a gunman discharging his firearm multiple times at a group of people standing at the intersection of 108th Street and Jamaica Avenue. No one was injured in that incident, police said. On Monday, officials confirmed that a shots-fired incident was caught on surveillance.

Prosecutors said there also was an eyewitness to that shooting.

Just minutes later, prosecutors said surveillance video captured Abreu, still clad in a green shirt seen in prior video, at the intersection of 126th Street and Hillside Avenue.

In that video, prosecutors said, Abreu pulled up alongside a parked minivan and shot the driver once in the head. That victim was transported to an area hospital. His condition was unknown Monday.

Next, at about 11:36 a.m., police said Abreu approached an unidentified 40-year-old man at the intersection of Jamaica Avenue and 131st Street, firing at him. That man was not injured in the attack, police said.

Just one minute later, prosecutors said, Abreu was caught on video at 134th Street and Jamaica Avenue, where he approached a pedestrian crossing the street and shot that victim in the shoulder. The victim was also transported to a hospital for treatment.

Police said officers were able to locate and arrest Abreu at about 1:10 p.m. after being able to find a picture of him during a video canvass. Abreu was riding his scooter when stopped by officers at the intersection of Sutphin Boulevard and 94th Avenue, near the Long Island Rail Road and AirTrain stations in Jamaica, police said.

Police found the 9-mm semi-automatic pistol, a magazine and more rounds, authorities said.

The investigation into the shootings included officers from the 75th, 101st, 102nd, 103rd, 107th and 113th precincts, as well as members of the Queens Homicide Squad.

A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports. Credit: Newsday Staff

'I'm going to try to avoid it' A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports.

A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports. Credit: Newsday Staff

'I'm going to try to avoid it' A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports.

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