Police chief Brian Manley speaks during a news conference near the scene where a woman was injured in a package bomb explosion in Austin on March 12. (Sergio Flores/Reuters)

AUSTIN — Austin police are investigating an explosion in a residential area on the city’s southwest side that caused multiple injuries, authorities said Sunday night.

Two men in their 20s were injured in the explosion on the 4800 block of Dawn Song Dr. They were rushed to the hospital with serious, but non-life-threatening injuries, Austin-Travis County EMS officials said on Twitter. Early Monday, a spokeswoman for St. David’s South Austin Medical Center said the injured men were in good condition.

It is not yet clear whether Sunday’s explosion is related to three package explosions this month that claimed the lives of a 17-year-old high school student and a 39-year-old construction worker, and seriously injured a 75-year-old woman, as The Washington Post reported last week.

“Given the darkness, we have not really had the opportunity to really look at this blast site to determine what has happened,” interim Austin Police Chief Brian…