Two explosions blew out windows at
campus in Emeryville, Calif., located across the bay from San Francisco.
No injuries or major damage was reported from the blasts, which occurred between 6 a.m. and 7 a.m. EDT, according to local television reports. A third blast shortly after 10 a.m. PDT was the result of a police bomb squad blowing up a suspicious object. According to broadcast reports, the third object was not a bomb.
Chiron shares were recently down 60 cents, or 1.2%, to $49.36.
A Chiron spokesman told KTVU-TV that the company suspected animal rights activists in the blasts.
Spokesman Martin Forrest said Chiron has received threats through the mail related to its animal testing.
"We believe this is the activity of animal rights activists and was meant to harass and affect the good work we are doing here," Forrest said. "We're not certain of anything right now. ... Where the bombs were located, it looks like they were external to the company."