Police in Florida were warning residents in the Tampa neighborhood of Seminole Heights to be on high alert Monday after the shooting deaths of three people with no apparent links to each other.

Police think the deaths could be the work of a serial killer, and they’re warning residents not to walk out alone at night.

Residents in the Tampa neighborhood lit candles at a vigil and walked in remembrance on Sunday night for the three people who have been gunned down over the course of two weeks.

“I’m not too sure if I feel safe or not,” Maria Rodriguez said. “Right now, just overwhelmed.”

The march was led by members of the victims’ families, including the father and stepmother of 20-year-old Anthony Naiboa.

“I just hope that someone just realizes the pain that our family, Monica’s family, as well as Benjamin’s family is going through, because justice has to prevail,” Rodriguez, Naiboa’s stepmother, said. “We own these streets! We own this community. And there has to be justice, justice has to prevail.”

Police are looking for an individual seen in surveillance video strolling through the neighbourhood, wearing a hoodie, on the night of the first murder.

“We have no leads,” Tampa Police Chief Brian Dugan admitted over the weekend. “We have no motive.”

What police do have is a disturbing pattern; three victims, strangers to each other but shot in the same area, in the same time frame.

“It’s clear to me that they’re all linked,” Dugan said.

On October 13, Monica Hoffa’s body was found in a vacant lot. Four days earlier, Benjamin Mitchell’s body was found less than a mile away.

On Thursday, police found the body of Naiboa, who was shot after taking the wrong bus home from work, about 100 yards from where Mitchell was killed.

At the vigil on Sunday evening, Anthony’s father Casimir Naiboa pointed to a place on the ground: “He was right on this floor, right here. They killed him just for nothing. Like he’s not a human, like he’s nothing.”

Patrol officers are canvassing the streets, hoping to find the killer and ease this community’s fear. The police were to hold a community meeting with residents Monday evening to talk about the murders, and how to stay safe.