 Rowan says a police presence serves to slow down drivers. An attempt to kill a hornet's nest went terribly wrong in Walla Walla Monday night. Firefighters responded to a residential structure fire just after 10 p.m. on the 1000 block of Willow Street. The use of bug spray and a torch on the home's exterior caused a smoldering fire that later spread to the attic. Damage is estimated at $150,000. No injuries were reported.