Both the San Francisco Bay Area CBS affiliate and the San Jose Mercury News have stories about an explosion that took place at around 7:00 last night at the PayPal offices in San Jose (here's a Google map of their location). 26 employees were reported to be in the building at the time of the explosion, but thankfully, nobody was hurt. The damage seems to have been limited to some plate glass windows.
The report says that a bomb was placed outside the exit of the PayPal section of the eBay/PayPal building, and fire department Captain Jose Guerrero says that the damaged plate glass was pretty thick and that the explosion it had to be pretty strong to do that type of damage. The CBS affiliate's report also states that “some kind of evidence” was found in the debris and makes the eerie statement that “no radioactivity was found”.
Our good thoughts go out to the people who work at eBay and PayPal, who are probably (and justifiably) a little freaked out right now.