ATLANTA — Three historically black churches have burned in less than two weeks in one south Louisiana parish, where officials said they had found “suspicious elements” in each case. The officials have not ruled out the possibility of arson, or the possibility that the fires are related.

“There is clearly something happening in this community,” State Fire Marshal H. Browning said in a statement on Thursday. “That is why it is imperative that the citizens of this community be part of our effort to figure out what it is.”

The three fires occurred on March 26, April 2 and April 4 in St. Landry Parish, north of Lafayette. A fourth fire, a small blaze that officials said was “intentionally set,” was reported on Sunday at a predominantly white church in Caddo Parish, about a three-hour drive north.

“But just as we haven’t connected the three in St. Landry, we haven’t connected the one in Caddo,” said Ashley Rodrigue, a spokeswoman for the Louisiana Office of State Fire Marshal, on Friday.