AUSTIN, Texas (KEYE) - An explosion that injured two men in southwest Austin on Sunday night -- the fourth explosion this month -- was possibly set off by a tripwire.
It happened in the 4800 block of Dawn Song Drive near Mopac and U.S. 290 around 8:45 p.m. Sunday.
There were reports of additional explosions in the same neighborhood, but those have not yet been confirmed.
Austin police are urging residents in the area of Dawn Song Drive to stay in their homes until given the "all clear" by officers.
APD Chief Brian Manley says residents within a half-mile radius of Dawn Song Drive are advised to stay inside or avoid the area until daylight, and that police are investigating a second item -- a backpack -- found in the neighborhood.
Early Monday morning, Manley said the explosion Sunday could have possibly been detonated by a tripwire.
He said investigators are "working under the belief" that the explosives are similar, but Sunday's bomb was possibly on the side of the road, not on a front porch.
I am asking our community to pay close attention to any suspicious device whether it be a package, a bag, a backpack or anything that looks out of place, DO NOT approach it! Call 9-1-1 immediately! Also remember DO NOT move, touch or open unexpected/suspicious packages! pic.twitter.com/jvyVB5I7SX— Chief Brian Manley (@chief_manley) March 19, 2018
The explosion injured two males who were riding or pushing bikes on the street.
Manley again urged residents of the Travis Country neighborhood to stay inside until morning. He also confirmed that Austin Independent School District school buses would not make pick-ups in the neighborhood Monday morning and any tardiness or absences would be excused.
VIDEO: Retreat at Travis Country subdision closed off and surrounded with APD, AFD, FBI and ATF. @chief_manley says it will be “daylight at minimum” before residents are allowed out or in. Investigators are sweeping the area for safety. #austin #explosion pic.twitter.com/GkvE66W3Kp— MelanieTorre (@melanietorre) March 19, 2018
There is no word yet if this is related to three previous explosions that happened earlier this month, killing two and injuring two.
Earlier on Sunday, Manley announced a new combined reward of $115,000 for information leading to the arrest of whoever is responsible for those explosions. Manley also urged the person or persons to come forward.
Regents School of Austin will be delaying classes two hours on Monday morning to allow for a complete security sweep of the campus due to the school's proximity to the explosion investigation.
Gates will be closed until 9 a.m. and classes will begin at 10 a.m.