One worker suffered minor injuries in Tuesday's blast, authorities said. "That's the industrial park I work in, '" he said.
The FBI's office in San Antonio told CNN Tuesday that they "suspect it is related to our investigation" into the Austin bombings.
If one perpetrator is behind all five blasts, then the person deployed an unusually wide range of skills and delivery methods, CNN law enforcement analyst James Gagliano said.
Police said another device in a package was discovered at the same FedEx location that didn't explode, according to the Post, but then recanted that statement.
One person at the facility in Schertz, Texas, was treated and released at the scene.
FedEx confirms both packages were shipped from the same FedEx store in Sunset Valley in South Austin.
An ATF vehicle sits in front of a FedEx distribution center in Schertz, Texas, where a package exploded early Tuesday.
Local police and the F.B.I. are investigating a motive to the mystery bombings.
The explosion happened occurred at a facility in Schertz, Tex., just northeast of San Antonio sometime around 1 a.m., said FBI Special Agent Michelle Lee.
As federal agents from across the country investigate the FedEx package explosion, the community is on edge.
"We are getting packages all the time, so I don't really think twice", Devonshire said.
On Monday, McManus said he was sending two bomb techs and a bomb dog to assist the ongoing investigation in Austin. The victims in two of those bombings were members of locally prominent African-American families, who were killed after picking up explosive packages that were by their homes. "And we hear this news about FedEx, and FedEx is right there".
Hours later, police sent a hazardous materials team to a FedEx facility in Austin to check on a suspicious package there. "We simply have to be cautious of all those [safety measures] we talked about prior [regarding suspicious packages]".
This is a developing story. That equipment would include real-time X-ray machines, he said, which could be used during the Final Four.
"This makes me sick", he said. "The safety and security measures in place across the FedEx networks are created to protect the safety of our people, customers and communities, and to assist law enforcement as appropriate". Schertz lies on the highway between Austin and San Antonio. "We're working with the Federal Bureau of Investigation and we've offered any additional investigative support that we might have".
"We are working very hard on these tragic events", she said.
Two people are dead and four injured, and authorities don't appear closer to making any arrests in the four bombings that have rocked the capital city. Ted Kaczynski, dubbed "The Unabomber", is serving eight life sentences for murder in that case.
He added that people who received unexpected packages or were suspicious of the return address should take precautions.
"If you see anything out of the ordinary or anything suspicious, we are asking that you call 911 immediately", Winston said.