Reuters/Sergio Flores Two men were injured Sunday night in a possible explosion in Austin, Texas, police said. The incident marks the fourth blast in the city in March — police have been investigating a string of deadly package bombs that killed two men and seriously injured an elderly woman. It's unclear whether Sunday night's explosion was connected to the three others. 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.See the rest of the story at Business InsiderSee Also:Terrified Austin residents have placed 150 calls to police about suspicious packages after three blasts rocked the cityPolice are investigating whether deadly package bombings in Austin were racially motivatedPolice are warning Austin, Texas, residents not to open unexpected packages amid spate of deadly bombingsSEE ALSO: Police say wave of package explosions in Austin, Texas, could be linked