Explosion at FedEx facility near San Antonio linked to Austin bombings

This baffling case has turned an average strip mall in a typical Austin suburb into an atypical crime scene. FBI agents taped off and then scoured a local FedEx location for evidence and fingerprints. 

Customer Chris Mrocka won't be shipping out packages from here today.

"So he walked into this FedEx where there are cameras? Good. Then he'll get caught," Mrocka said.

People here hope he's right. Authorities say the bomb that exploded this morning in a FedEx plant in Shertz came from here. A suspicious package found at another FedEx location in Austin may have also. That one did not detonate on its own, authorities handled that.

After four confirmed bomb blasts in three weeks that have killed two and injured four, people are in a slow burn panic. Some apartment complexes are sending statements to residents saying they are no longer accepting packages. Police are urging everyone to use caution.

"If anything suspicious, whether it be a package or just something out of the ordinary that you don't feel comfortable with or you are unsure about, please call 911 and let out officers assist," said officer Destiny Winston.

Austin police say they've handled over 1,200 such calls since the bombings began. Investigators say the bomber is switching techniques and targets. The earlier package bombs weren't delivered. Nevertheless, worker at the Austin FedEx facility say whether this suspicious package was a bomb or not this seemed inevitable.

"It's definitely hitting home for me now that it's actually here. I expected it to be either us or UPS of LSR or one of the other carriers to eventually get involved in it. But yeah. This is crazy...," said mechanic Matt Conner.

The investigation has become a national effort. Not only are state and federal agencies involved, but local departments are as well. HPD has sent bomb technicians and a bomb sniffing dog to help out.