NASHUA - An Amory Street man suffered burns to his face, hands and upper torso Tuesday night in an incident which remains under investigation by Nashua police and fire and state agencies.

The man in his 30s, whose name fire officials did not release, was found at 3:55 p.m. suffering from burns outside his apartment at 11 Amory St., No. A.

Deputy Chief Michael O'Brien Sr. said the man had severe burns covering 20 percent of his body. He was treated at the scene by Nashua Fire Rescue and AMR ambulance workers and then transported to Southern New Hampshire Medical Center for further treatment.

O'Brien did not know the man's condition Wednesday morning and said it was likely the man was transported to a Boston hospital for further treatment.

He said when firefighters first arrived on the scene, they were told the man suffered the burns at another location. O'Brien said, however, there was evidence of a minor fire inside the man's apartment. O'Brien would not say what firefighters found inside the apartment but police were called to the scene.

The cause of the fire remains under investigation, O'Brien said.

"It's an active investigation," he said.