A "sound bomb?" A "warning missile?"

In what appeared to be a new Israeli tactic, the military called at least some of the houses ahead of time to warn inhabitants of an impending attack. In some cases, it also fired a sound bomb to warn away civilians before flattening the homes with powerful missiles, Palestinians and Israeli defense officials said....

They said the Israelis either warned nearby residents by phone or fired a warning missile to reduce civilian casualties.

.