Authorities are investigating after video showed a small explosion Thursday afternoon at a well-known tree on UNC Chapel Hill’s campus in North Carolina.

An alert from the school said a small device was detonated in McCorkle Place at the Davie Poplar tree, according to WTVD.

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A Snapchat video shows a man trying to put out the fire at the tree, and then it suddenly explodes.

Officials said the man was injured, but it's not clear how badly.

They also said a suspect is in custody related to the incident.

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez