A man who fatally shot a 20-year-old woman on Wednesday morning in Orange County, Florida, returned to the scene later in the day and went on a shooting spree, the authorities said, killing a TV news reporter who had been covering the original homicide and a 9-year-old at a nearby home.

The gunman shot two other people in Pine Hills,Florida, the Orange County Sheriff’s Office said in a news conference on Wednesday: the mother of the 9-year-old and a photographer who worked with the TV news reporter at Spectrum News 13 in Orlando.

They were both in critical condition on Wednesday night. Spectrum News identified the journalist who was killed as Dylan Lyons and the photographer who was wounded as Jesse Walden. The names of the other victims were not immediately released.

A suspect, whom the authorities identified as KeithMelvin Moses, 19, was in custody by Wednesday evening and was charged with one count of murder in connection with the killing of the 20-year old.

Additional charges were expected for the other shootings in Pine Hills, about five miles east of Orlando, said theOrange County sheriff, JohnMina. He said that it was unclear why the five victims who were shot on Wednesday were targeted.

The 20-year-old woman was an acquaintance of the gunman, Sheriff Mina said,but officials were still investigating a motive in that killing. He added that there was no apparent connection betweenMr. Moses and the four other people who were shot. It is also unclear whether the gunman knew that the reporter and photographer in the vehicle were journalists.

New York Times News Service