Mitchell is to mediate the planned four-month indirect talks between the Israelis and Palestinians.

Negotiations have stalled since Israel's three-week assault on the Gaza Strip in December 2008.

One of the targets Israel hit on Monday was reported to be a tunnel in Rafah.

Israel accuses Palestinians of using a vast network of tunnels to smuggle weapons into the territory; Palestinians say the tunnels are a lifeline for bringing in essential supplies because Israel has blockaded the territory since June 2007, when Hamas seized control from Abbas's Fatah faction.