GAZA CITY, Gaza Strip — Israeli warplanes and gunboats on Saturday blasted more than two dozen Hamas targets, including weapons storage facilities, training centers and leaders' homes as Israel's offensive against Gaza's Islamic militant rulers entered a second week.

However, there were tentative signs the fighting may be nearing an end. Most of the airstrikes targeted empty buildings and abandoned sites, suggesting Israel may be running out of targets.

French President Nicolas Sarkozy is visiting the region next week, and President George W. Bush and U.N. chief Ban Ki-moon both spoke in favor of an internationally monitored truce.

Israel launched the offensive on Dec. 27 in response to intensifying rocket fire by Hamas militants in Gaza. The operation has killed more than 430 Palestinians.

In the latest attacks, the Israeli army struck the homes of two Hamas operatives, saying the buildings were used to store weapons and plan attacks. Hamas outposts, training camps and rocket launching sites also were targeted.

The army also struck the American International School, the most prestigious educational institution in Gaza. The school is not connected to the U.S. government, but it teaches an American curriculum in English.