A packaged exploded at a Texas FedEx distribution center in San Antonio early Tuesday morning, and investigators are saying it is linked to four other blasts that occurred earlier this month in Austin.

The explosion happened as a package was on a conveyor belt in the middle of the night.  Only one worker suffered minor injuries that were "percussion related."

WCVB reported:

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Hours after the explosion, police sent a bomb squad to a FedEx facility outside Austin’s main airport to check on a suspicious package that was reported shortly before sunrise. There was no immediate word about whether that package contained explosives.

Investigators also closed off an Austin-area FedEx store, where they believe the bomb was sent to the distribution center. Authorities roped off a large area around the shopping center in the enclave of Sunset Valley.

FBI Agent Michelle Lee said the explosion occurred around 1 a.m.

“It would be silly for us not to admit that we suspect it’s related” to the other four Austin bombings since March 2, Lee added.

The package had been sent from Austin and was addressed to a home in Austin, Texas, according to Attorney General Ken Paxton.

The size, weight and description of the package is still unknown, though it should be in the FedEx system.

Both packages are believed to have contained nails, a source told NBC.

FedEx confirmed "the individual responsible" for the blast also sent a second package, which was found at the distribution center in Schertz, about 20 miles northeast of San Antonio and 65 miles south of Austin.

"We have provided law enforcement responsible for this investigation extensive evidence related to these packages and the individual that shipped them collected from our advanced technology security systems," FedEx said in a statement.

Four blasts have occurred since March 2 in Austin.  This fifth explosion seems to be related.

The tripwire mechanism was elaborated on by the FBI.

"With this tripwire, this changes things," Christopher Combs, special agent in charge of the FBI's San Antonio division, said at a news conference on Monday, referring to the previous day's explosion. "It's more sophisticated, it's not targeted to individuals. ... A child could be walking down a sidewalk and hit something."

Three hundred and fifty special agents from the FBI have been deployed to investigate.

Well, that makes everyone feel safe now, doesn't it?  I mean this is the same FBI that encouraged the Garland jihadis and failed to protect Pamela Geller and those in attendance for the Muhammad Drawing contest, right?  Yep, same agency.

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