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Two people were injured in another explosion in Texas' capital Austin, the fourth mysterious bombing in the city this month, sparking panic among residents and leading authorities to believe that they are dealing with a "serial bomber".

Austin police confirmed this morning that the latest bombing in the city appears to be related to other recent deadly explosions in the city and that a tripwire was used to trigger an explosive device nestled along a fence.

The latest explosion injured two young men in the well-to-do neighborhood of Travis Country, far from the sites of the other explosions which happened in East Austin, and caused police to warn residents to stay inside until 2 p.m.

The three prior bombs were left as packages on doorsteps, while Manley said Sunday's device was different: It was placed on the side of the road.

Police later said the victims were in good condition.

On March 18, the Austin Police Department reported more than 500 federal agents are assisting in the investigation, 435 leads have been called in, 236 individuals have been interviewed, and 735 suspicious package calls have been responded to.

But Manley says Sunday's package was different.

"We said from the beginning, we're not willing to rule anything out".

Manley did the same yesterday when announcing a $100,000 reward for any information that could lead to an arrest - that's in addition to a $15,000 reward being offered by Gov. Greg Abbott's office.

"Stay inside your home until we have had a chance to deem this neighborhood safe", Manley said at a news briefing Sunday.

"There's a certain level of skill and sophistication that whoever is doing this has, and. we are hoping to use the evidence we have to track them down based on what we are seeing on all three scenes that seem to be consistent", Manley told KXAN.

Police tape marks off the neighborhood where a package bomb went off on March 19, 2018 in Austin, Texas.

Austin Mayor Steve Adler wants residents to be on the lookout and call 911 right away if they see anything suspicious.

The men had been biking or walking their bicycles in southwest Austin when the explosion happened.

Emily Chenevert, interim CEO of Austin Board of Realtors (ABoR), meanwhile said the trip wire that detonated the bomb added "a new element of danger" to real estate agents in Austin. But the victims on Sunday's explosion were two white men, leaving open the question of whether the victims' identities matter to the bombmaker.

Additional reporting from Newsy affiliate CNN.

Morris, of Tripwire Operations Group, said tripwire type devices are not targeted to any specific type of person.

He said: "These events in Austin have garnered worldwide attention and we assure you that we are listening".

Police said all four incidents have similarities but have not yet made a broader connection or identified a motive. As the day moves on, that is something that we are going to analyze. Two bomb technicians and a bomb canine from SAPD will travel to Austin to help with the investigation of the bombings that have kept Austin on edge.

Those bombs were in packages, typically left on doorsteps early in the morning or overnight, officials previously said.

Adler said an "army of law enforcement" is working to get to the bottom of the case.

"Not a single one of these bombs has exploded without being handled", he said.

The victims of the earlier bombings include Draylen Mason, 17, an orchestral musician and notable essay victor, and Anthony Stephan House, a 39-year-old father.

"We want to understand what brought you to this point and we want to listen to you".