May 18 (UPI) -- A 25-year-old man on Sunday has been tentatively identified as the suspect in an explosion outside a Southern California fertility clinic that injured four and and killed one.

The FBI believes Edward Bartkus, a resident of Twentynine Palms, home to a large U.S. Marine Corps base, about 58 miles northwest of Palm Springs, used a vehicle-borne improvised bomb. The explosion occurred at 11 a.m. PDT Saturday and damaged several buildings.

"We are working through some other technical means to positively identify the decedent here, but we believe at this moment, based on the evidence that we've gathered, that that is Mr. Bartkus as the decedent here," Akil Davis, assistant director in charge of the FBI's Los Angeles Field Office, said at a Sunday morning news conference.

None of those injured are believed to be staff members of the clinic, city officials said.

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