2 men were injured in a possible explosion in Austin, Texas - the 4th blast this month

Two men were injured in a possible explosion reported in southwest Austin, Texas, on Sunday evening, police said.

The Austin Police Department said on Twitter that residents near the area should stay in their homes until officers instruct otherwise.

The incident comes after a recent string of deadly package bombings, which killed two black men and severely injured an elderly woman in March.

It's unclear if the explosion on Sunday night was caused by another package bomb, or was at all related to the previous blasts.

Police said in a press conference earlier on Sunday that they wanted whoever was responsible for the package explosions to come forward and share their "message."