ROCK HILL — Three Rock Hill homes — two of them vacant with “condemned” signs on the front — burned Tuesday afternoon in a blaze that destroyed one of the houses and melted the vinyl siding of another.

A Rock Hill fire battalion, three engines and a ladder rushed to homes on 1046, 1050 and 1054 Henderson Street around 1:45 p.m., said Rock Hill Fire Department Battalion Chief Ben Funderburk. The house at 1050 Henderson St. was completely engulfed, suffering $70,000 in damage.

The 1054 Henderson St. house, with its side and roof partially burned, had about $25,000 in damage and the house at 1050 — the only home occupied by people, who weren’t home at the time of the fire — had $3,000 in damage because of melted vinyl.

Capt. Karen Kane said fire officials will work with police to determine if the fire might have been intentionally set.

Investigators believe the fire began at 1050 Henderson St. before spreading to the neighboring houses, Kane said.