Updated at 9:55 p.m.: Revised throughout to include additional details from police.

After two explosive devices were discovered Tuesday in Central Texas, many feared an incident at an Austin Goodwill store that evening was the latest attack by a serial package bomber.

But after a military-style device ignited in an employee's hand, Austin police said they had no reason to think it was connected to previous package bombs. In a city rocked by the threat of explosions, that hardly mattered to some.

"We have no reason to believe this is an attempt at a copycat," Assistant Police Chief Ely Reyes said.

The employee was disposing of a box of items dropped off at the Goodwill in the 9800 block of Brodie Lane, near West Slaughter Lane, when he spotted two small items and picked one up before it went off, Reyes said.

The item was not a bomb, but an incendiary device described as an "artillery simulator device" or military memento, he said.

The employee was transported after 7 p.m. to St. David's South Austin Medical Center with injuries not considered life-threatening. He was treated and had been released by 9 p.m., the Austin American-Statesman reported.

"In this town, if an incendiary device goes off, everybody just scatters and panics," said Gary Davis, president and CEO of Goodwill Texas. "We're all on edge."

The store will remain closed Wednesday, but all other Goodwill locations will be open for regular hours.

Thank you for your well-wishes and concern this evening around the incident at our Brodie Store. We are thankful that our Goodwill Team Member has been released from the hospital. — Goodwill Austin (@AustinGoodwill) March 21, 2018

The assistant police chief reiterated the importance of reporting suspicious packages, boxes or other items to police.

"We want the community to continue to be vigilant," he said. "We want all of these incidents [solved] and we want them solved quickly, and we can do that together as a community with your help."

Authorities will review surveillance footage to try to determine who dropped off the box, whether there was any malicious intent or if any charges will be filed, Reyes said.

In many instances, he said a family member may find a military style memento and not know how to dispose of it. Reyes encouraged people in that situation to call police.

The Goodwill is about three miles from the FedEx Office store from where officials say someone sent two packages containing explosives. The location is minutes from the Travis Country neighborhood where two people were injured Sunday evening in an explosion triggered by a tripwire.

A parcel on a conveyor belt exploded about 12:30 a.m. Tuesday at the FedEx ground facility in Schertz, outside San Antonio. No major injuries were reported.

Hours later, a suspicious package was reported at a FedEx Ground facility in the 4100 block of McKinney Falls Parkway, near Austin Bergstrom-International Airport.

Police, the FBI and ATF responded and determined the package contained an explosive device, the FBI said in a statement.

The exploded parcel and the suspicious package were both sent by the same person from the FedEx Office store in the 5600 block of Brodie Lane in the Sunset Valley suburb, officials said.

Four package bombs have detonated in Austin this month, killing two people and injuring four others.

The Associated Press contributed to this report

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