Austin bombings: What we know now, including the blast near San Antonio

John Bacon | USA TODAY

Show Caption Hide Caption FBI: Schertz, Texas bomb may be linked to Austin bombings Another bomb has exploded, this time, at a Fed Ex facility just outside of San Antonio, injuring one woman.

Four mysterious explosions in Austin this month have killed two people and wounded four more. Now a fifth blast has taken place at a FedEx facility in Schertz, a suburb of San Antonio about 65 miles southwest of Austin.

Here is what we know:

Where did the the latest bombing take place?

A package bomb exploded at a FedEx facility near San Antonio at about 12:30 a.m. Tuesday. Schertz police said the explosion came from a package in the sorting area of the facility. One person was treated for injuries and released at the scene, the police department said in a statement. No arrests have been made.

Are the bombings connected?

Austin Police Chief Brian Manley said the four attacks in Austin appeared to be connected. "Clearly we are dealing with a serial bomber," he said. After the blast in Schertz, FBI San Antonio spokeswoman Michelle Lee said "it would be silly for us not to admit that we suspect it’s related” to four bombings in Austin this month.

When did the bombings begin?

The first package exploded March 2, killing Anthony Stephan House, 39, when he picked up a package on the front porch of his northeast Austin home. The second bomb went off March 12 inside a home in east Austin. Draylen Mason, 17, was killed and his mother was hospitalized. The third blast came a short time later in a neighborhood south of downtown. A 75-year-old woman picked up a package on her front porch when it exploded, seriously injuring her. The last Austin blast occurred late Sunday, when a blast, possibly set off by a tripwire, injured two men in southwest Austin.

Are all the bombings similar?

The first three attacks involved suspicious packages left on doorsteps in Austin. The package Sunday apparently was left on the side of a road in the city. The latest explosion took place at a FedEx facility about 65 miles from Austin.

What is the motive for the attacks?

Police say they have no idea why the bomber or bombers have been building the explosive packages. Before Sunday's blast, Manley held a televised news conference in which he pleaded for those responsible to come forward. "We assure you, we are listening and we want to understand what brought you to this point, and we want to listen to you, so please call us." Authorities said hate crimes had been considered. The victims of the first three attacks were black and Hispanic. Sunday's victims were white males.