The incident follows a deadly explosion in Austin on March 2.
ABC affiliate KVUE reported that a male teenager who has not been publicly identified was reported dead on the scene and a woman in her 40s was transported to a nearby hospital with potentially life-threatening injuries. No one else was injured in the explosion.
Austin Police Chief Brian Manley believes that because of the evidence, there is a strong possibility the two are linked.
Manley said investigators know what kind of explosive device was used, but police are not revealing details in order to preserve the integrity of the investigation. At the time, police said they believed it was an isolated incident.
Special Agent Michelle Lee, a San Antonio-based spokesman for the Federal Bureau of Investigation, said the agency "responded to both events" and was assisting Austin police which were taking the lead on investigating.
Afghan CEO blasts Taliban for not responding to peace offer
Rahimi said 56 militants were killed and dozens of others were injured in the air strikes. Four days earlier, Taliban attacks on police checkpoints killed eight police officers.
Police said the package in the first home explosion on March 2 was not connected to a specific carrier or vendor, and are reviewing other carriers besides the U.S. Postal Service for Monday's package.
"There are similarities that we can not rule out that these two incidents are, in fact, related", Manley said. It happened as thousands of visitors are descending on the city for the South by Southwest music, film and technology festival, and authorities urged residents to call the police if they receive any packages they aren't expecting.
Manley said in both cases, the suspect delivered the packages during the nighttime, and the victims found them in the morning on their doorstep.
BREAKING: Officials tell me that they will immediately try to determine similarities between packages in two recent blasts.