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A device that exploded shortly after midnight on Tuesday at a FedEx facility in Schertz, Texas, is likely linked to a string of bombings that have rocked the state's capital this month, federal officials said.

The blast came a day after authorities in Austin said a "serial bomber" is likely responsible for four explosions in the city earlier this month, the latest of which injured two people Sunday night after they crossed a trip wire possibly made with fishing line.

Austin Police Chief Brian Manley said at a news conference on Monday that although the Sunday night bomb was linked to the three previous blasts, it showed more sophistication than the prior explosions, which involved package bombs left on people's doorsteps.

On "Fox & Friends" on Tuesday morning, former CIA analyst Buck Sexton said the FedEx bombing could lead to a break in the case.

"It's likely that this individual had to go to one of their facilities somewhere. There will be surveillance footage most likely of whoever dropped off the package there," Sexton said. "They're going to be looking at anything that was done here at any stage of this process, and just trying to get some basic profile of the suspect. But this one seems to be, I would wager, the most likely for there to be a break in the case."

Brian Kilmeade said it's as if the bomber is growing more cocky.

As of Monday, the reward for information leading to an arrest in the deadly explosions had risen to $115,000. Manley said more than 500 officers, including federal agents, have conducted 236 interviews in following up 435 leads.

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