Police have found similarities between two of the three explosions that took place in Austin, Texas this month — including that all the victims are minorities.

As Dallas-Fort Worth's NBC 5 reported Monday, investigators are working to determine whether race played a motivating factor in the explosions after packages were left on the front doorsteps of two black families and a Latino woman in the Austin area.

Two explosions occurred on Monday alone, and the first happened on March 2. The two explosions today took place roughly five miles apart from each other, with the other taking place 12 miles away from the first.

During the first explosion on Monday, a 17-year-old boy was killed and a 70-year-old woman was hospitalized, and another woman in her 70's was also taken to the hospital following the second explosion. On March 2, 39-year-old Anthony Stephan House was killed when a similar package exploded at his home. His death is being investigated as a homicide.

"There are similarities, and we cannot rule out that these two incidents are in fact related," Austin police chief Brian Manley said of the first two bombing incidents.

In all of the cases, packages that police confirmed were not delivered by the United States Postal Service were found on the front doorsteps of the victims' homes. During the first explosion early on Monday morning, the package was brought into the home before it detonated and killed the 17-year-old.