WASHIGNTON (AP) _ The State Department today warned Americans in Israel, on the West Bank and in Gaza there is an increased possibility of terrorism.

While there is no reason to believe there is a specific threat against Americans, the U.S. Embassy in Tel Aviv and the U.S. Consulate in Jerusalem urged all U.S. citizens to be vigilant, the department said in a statement.

Americans in Israel should be alert to their surroundings and report suspicious packages or any unusual activity to the police, the statement said.

Caution was advised especially when using public transportation or in crowded areas and at bus stops.

The statement gave no explanation for the heightened concern.

In the past, though, terrorists often struck when Israel and the Arabs reached or approached agreement.

Israel is negotiating with the Palestinians on setting up a Palestinian state. The future of Jerusalem also is up for grabs.