To attain some ground in the case, Texas Gov. Greg Abbott has set out a reward of up to $15,000 for information leading to the arrest of the person or people involved in the package bombs.
FBI teams from Austin, San Antonio and Dallas were investigating as was the Bureau of Alcohol, Tobacco, Firearms and Explosives.
An explosion that killed a teen in Austin is believed to be linked to another deadly blast in the city this month. Another package exploded about five miles away hours later, injuring a 75-year-old woman. Monday's second explosion occurred around the Montopolis neighborhood, about 5 miles south of the day's first blast.
"Enjoy yourself. Have a good time", Police Chief Manley told festivalgoers.
As investigators combed through the scene, residents from south Austin called police about another explosion inside a house.
This week's attacks killed a 17-year-old boy in an early Monday morning blast as he handled the package.
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Investigators have not ruled out the possibility these package bombs may be related to terrorism or hate crimes. He suggested that the bombings may be constituted as hate crimes.
Manley stated, "We are not going to tolerate this in Austin, and you have seen every stop will be pulled out...the federal agencies are with us to lend us a hand and to bring this to as quick a resolution as possible". Manley said that a package detonated as the woman attempted to remove it from her porch.
All the victims, including a 39-year-old man who died in the March 2 blast, were either African-American or Hispanic, Manley said. He was the first to find House and tried to save his life. He says, "You don't hear that stuff in my neighbourhood".
She said residents were on high alert - made nervous even by packages addressed to them.
One person was killed in a similar package bombing on March 2nd, also in Austin. Austin-Travis County Emergency Medical Services took a woman in her 40s to Dell Seton Medical Center, and she is expected to be okay, Austin police confirmed at a press conference.
Relatives told the Post that the woman injured in the third blast was Esperanza Herrera.
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A suspicious package caused quite a scare in Coppell late Monday night. Boulevard. Police said they received a report from a caller that there was some type of explosion and that two people were injured.
Police Chief Brian Manley said Monday that investigators hope to collect surveillance video from nearby homes to identify a suspect. The identity of boy killed in Monday morning's blast has not been released.
That woman's injuries were not life-threatening, he said.
A 39-year-old man was killed in the March 2 attack.
Two parcel bombs rattled the United States city of Austin on Monday, 10 days after a similar deadly blast, as Texas police said they were investigating the possibility of serial hate crimes against African Americans.
Package bombs have rattled the capital of Texas, putting residents on edge.
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Festival organizers did not immediately say whether they would be taking extra precautions.