Due to recent package explosions in Austin that have claimed the lives of a 17-year-old boy and a 39-year-old man, and left two others wounded in three separate incidents in the suburban neighborhoods of Austin, the US Postal Service encourages everyone to beware of suspicious mail or packages.

The victims found the three packages, that contained a bomb, left at their door steps.

According to published reports, Austin police said the three bombings in eastern Austin may be linked. All the victims were minorities, and investigators are looking into whether race is a factor.

“Anyone who finds a package without UPS, Federal Express or any other markings should leave the package alone,” said Alice Police Chief Rex Ramon. “I suggest to anyone who finds a suspicious package not to open it, instead call authorities…we will call the proper authorities to check on the package. People should know if they are expecting a package, don’t just open anything.”

According to the US Postal Service, if anyone receives a suspicious letter or package they should not handle it, isolate it immediately, and don’t open, smell or taste it.

If you suspect the mail or package may contain a bomb call 9-1-1.

FBI teams are investigating along with the Bureau of Alcohol, Tobacco, Firearms and Explosives the incidents in Austin.