BRUSSELS, Belgium (AP) _ Reaffirming their solidarity with the United States, European Union leaders on Friday gave their backing to ``targeted'' U.S. retaliation against countries harboring terrorists and said they were prepared to help.

``We reaffirmed our full solidarity not only from the heart but also from our sense of reason,'' French President Jacques Chirac said. ``To be clear, we will not sit on the sidelines of this battle against this scourge.''