ainsley: jane is with our austin, texas affiliate live on the ground. jane, what is the latest? er the course after month in these four explosions. now last night the explosion the police got a call at 8:30 in this southwest austin neighborhood. two men in their 20s or riding or pushing their bicycles. they were injured when they possibly triggered a trip war causing an explosion. the chief of police here said could not confirm the tripwire aspect immediate, he said the bombs have different kinds of projectiles in them. the men are in critical condition at a austin hospital. they ask people to stay inside their homes and follow officers instructions while they search for a possible bomb. there is a claims of a possible device in a backpack. they're looking if the latest explosion is related to the previous three explosions we experienced this month here in austin that killed two people and injured two more. in those cases bombs detonated when packages were opened by the victims. police are warning all austin residents about anything that looks suspicious, not just those packages.