Yolo County prosecutors said during a hearing Friday that several common explosives were recovered in the apartment of David Snyder, including nitroglycerine, The Sacramento Bee reported ( http://bit.ly/UQ3ZjA).
Investigators also found a vial of triacetone-triperoxide, known by its initials TATP; hexamethylene triperoxide diamine, or HMTD; and RDX, prosecutors said.
Also known as cyclonite, the powerful RDX is a primary ingredient in C-4 explosives and in blasting caps.
Snyder, 32, suffered hand injuries in the Jan. 18 blast at his campus apartment. He had been warned in the past not to make explosives at his university's labs, prosecutors said.
"He already knew it was against the law," said Yolo County Deputy District Attorney Martha Holzapfel.
Prosecutors have also added several firearms charges—including charges for weapons investigators said were recovered from the apartment—as well as for what prosecutors described as "multiple boxes of ammunition" found in the apartment.
Snyder has pleaded not guilty to the charges.
Snyder—who was being held in lieu of $2 million bail—was denied a request by his attorney, Linda Parisi, to reduce bail to $500,000.
"There's nothing to suggest animosity or ill will" toward the university, Parisi said.
UC Davis officials declined to comment on Friday's hearing but said campus administrators in 2011 had received a complaint stemming from a 2009 incident in which Snyder and a classmate were accused of making small firecrackers in a chemistry lab.
The complaint was reviewed and the case closed, university officials said.
UC Davis police have said they have no information to suggest that Snyder was planning "some broader crime on the campus."
Information from: The Sacramento Bee, http://www.sacbee.com