TEXAS: Two people were injured late Sunday in an explosion at a home in Austin, Texas, the fourth mysterious bombing in the city this month, police said. The blast came just hours after police made a direct public appeal to the unknown bomber or bombers suspected of other recent bombings. An exploding package killed a 39 year-old man on March 2. On March 12, one exploding package killed a 17-year-old boy and another separate one injured a woman. After the latest blast, the county Emergency Medical Service said on Twitter that they responded to reports of an explosion around 8:30 pm (0130 GMT Monday), and two men in their 20s were rushed to a hospital with serious injuries. Authorities were investigating the previous bombings as possible hate crimes as the two men killed were African-American, and a Hispanic woman was seriously injured. Police did not mention the race of the Sunday victims. “Stay inside your home until we have had a chance to deem this neighborhood safe,” Austin interim Police Chief Brian Manley said at a streetside news conference after the blast. “That will not be, at a minimum, until daylight, given the darkness and the size of the area that we want to go in and check to make sure again that this neighborhood is safe.” Because of the darkness “we have not really had an opportunity to really look at this blast site to determine what has happened,” Manley said.