OAKLAND — A wheelchair-bound man who blew himself up with a pipe bomb two weeks ago at an East Oakland health clinic was identified by authorities Monday as Ralph Mark Harris, 60, of Hayward.

The Alameda County Coroner’s Office said they had no occupation listed for Harris.

The case is being investigated as a suicide but has not yet been officially classified, officials said.

What caused him to detonate the bomb has not been officially determined.

Both his parents are dead and he has few relatives in the area, authorities said.

Harris’ niece, who did not want her name used, said Monday her uncle became paralyzed after a motorcycle accident in the 1980s.

She said she last talked to him a few years ago after his mother died.

She said she thought he was depressed “but I don’t think he had a problem with the clinic. It was the place he felt safest and people cared for him.

“I think he had not been happy for a very long time.”

The fatal explosion happened about 6:26 p.m. Oct. 18 in the lobby of the San Antonio Neighborhood Health Center, 1030 International Blvd.

Harris waited for all the patients to leave and told a security guard to leave as well before detonating the bomb, authorities said.

The San Antonio neighborhood facility is part of La Clinica de la Raza. A health center there representative did not immediately return an inquiry seeking comment on Monday.

The San Antonio clinic opened in 1977 with “one doctor, a nurse, a social worker and four community health workers” and merged with La Clinica in the 1980s.

Check back for updates.