"They saw the flames coming out from underneath the house,” she said. “They called the fire department. If it had been 30 minutes later, it would have been a whole different ballgame."

Lopez-Bradshaw said her background is in fire prevention with the county, and she said she was given the task of opening the home's windows once the fire was put out.

She said she understands the concern some of her neighbors were feeling Monday night.

"We have quite a few people who live around here all the time around the block,” Lopez-Bradshaw said. “So we know who comes and goes. But whoever it was is a person who, they get a thrill out of seeing a fire."

St. Augustine Fire Marshal Capt. Bob Growick said he understands the concern many are feeling in the area. Without going into specifics, he wants neighbors to know that the police and city leaders are keeping an eye out.

"They're going to be out here, and they're going to be doing some things to help the community,” Growick said. “We want them to understand, the citizens who live here, plus the people who come here that we serve, we want them to know they're still safe in this city."

Neighbors said they are being careful. Growick said people need to pay attention to who is in their neighborhoods. They need to keep an eye on people they don't recognize, and if they see something they don't like, they need to call police right away.

In the meantime, authorities hope someone knows the identity of the man seen on surveillance footage.

"We just want to ask him some questions,” Growick said. “Maybe he can give us some answers to help us with the investigation."

Anyone with any information about the fires is asked to call 877-NO-ARSON (662-7766) or Crime Stoppers at 888-277-8477. Callers can remain anonymous and could be eligible for a cash reward.