A “serial bomber” is likely responsible for four detonations in Austin this month, the most recent of which disabled two people on Sunday night after they spanned a trip wire, maybe established with fishing string ,, officials disclosed Monday.

Austin Police Chief Brian Manley read at a news conference Monday morning that although the bombard that injured two men on Sunday night was linked to the three previous explosions, the latest rocket committed a tripwire while the previous blowups were package bombs left on people’s doorsteps.

“We’ve read a change in the method this suspect is use, ” he told reporters.

Frederick Milanowski, the special agent in charge for the Bureau of Alcohol, Tobacco and Firearms, announces the most recent missile was “more sophisticated” because it use a tripwire. Milanowski said tripwire inventions are triggered by victims pertaining any kind of pres or tension.

A bomb detecting component saunters along a street near the background of an detonation on March 18. ( Nick Wagner/ Austin American-Statesman via AP)

“We are more related now. That is, people see something suspicious they stay away and contact law enforcement, ” he said.

The servicemen injured Sunday night in the explosion in the southwestern Austin neighborhood of Travis Country, ages 22 and 23, are white, unlike the victims in the three earlier onslaughts, “whos” black or Hispanic. The husbands were riding or pushing bicycles when the explosives detonated, that is different from the first three attempts, which involved parcel missiles left on people’s doorsteps, according to police.

Authorities on Monday were canvassing the province in search of anything suspicious, and residents were reminded to remain indoors and to call 911 if they needed to leave their homes before 2 p.m.

Travis Country is far from the places of the earlier bombings, which occurred over two-plus weeks in residential vicinities east of Interstate 35, which divides the city.

At a news conference hours after Sunday’s blast, which happened around 8: 30 p.m ., Manley recurred his public warn for people to not pick up or approach suspicious packages.

“We want to put out the meaning that we’ve been putting out and that is , not only do not touch any packets or anything that looks like a container, do not even croak near it at this time, ” Manley articulated. Because “we have not had an opportunity to look at this explode website to genuinely determine what has happened.”

AUSTIN PACKAGE BOMBS PROBABLY ‘PRETTY SIMPLE, ‘ COMPONENTS COULD LEAD COPS TO SUSPECT, EXPERTS SAY

A witness speaking to FOX7 described sounding a “loud bang, ” adding that it was “not a vehicle clang , not gunshots but something terrible.”

Thad Holt, 76, who lives near the scene of the fourth explosion, told Fox News the neighborhood is “very quiet, ” with a lot of families.

Authorities work at the incident of an blowup in Austin, Texas on March 18. ( Nick Wagner/ Austin American-Statesman via AP)

“We were surprised because it all had been concentrated on that slope of municipality, in lower income places but this is a real, nice place, neat residences, everything from retired beings to professional beings, ” he supposed. “It’s a pretty crime-free neighborhood.”

Holt, who has lived in the neighborhood for almost 18 years, said he had taken a march with his wife around 7:30 and stepped right past the arena at a part to 8.

“Nothing like this happens here, ” he said.

Sunday’s explosion was the fourth to rock Austin in less than three weeks. Nonetheless, the three previous explodes occurred on the eastside of the city.

AUSTIN PACKAGE BOMB ATTACKS TIMELINE

The first was a container projectile that explosion at a northeast Austin home on March 2, killing 39 -year-old Anthony Stephen House. Two more package bombs then exploded farther south on March 12, killing 17 -year-old Draylen Mason, wounding his mother and disabling a 75 -year-old woman.

A map shown in the point of each of the four bombings in Austin. ( Fox News)

Police announced all three of those were likely referred and implied containers that had still not been forwarded or put forward by private carrier but left overnight on doorsteps. Manley initially recommended they could have been hate crimes since all the victims of the first three blowups were black or Hispanic, but now says that investigators aren’t ruling out any possible motive.

Authorities on Sunday said the honor for message to move to an apprehend in the fatal blowups has risen by $50,000 to a new total of $115,000. Manley alleged more than 500 men, including federal agents, have conducted 236 interrogations in following up 435 leads.

Fox News’ Shira Bush, Ryan Gaydos, and The Associated Press contributed to this report .

Travis Fedschun is a reporter for FoxNews.com. Follow him on Twitter @travfed

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