Israeli Soldier Feared Kidnapped In Gaza
Fighting broke out around two hours into a three-day ceasefire which was later declared over by Israel.
The US and UN said the truce was aimed at "giving innocent civilians a much-needed reprieve from violence".
But at least 50 Palestinians are thought to have been killed today and there have also been a number of Israeli casualties.
Israeli tanks shelled the southern town of Rafah, according to Palestinian officials.
An Israeli government spokesman said artillery was fired in response to a "serious incident" on the border in the Kerem Shalom region while the army said a heavy exchange of fire had erupted.
Israel said a number of rockets and mortars were fired from Gaza as both sides accused each other of breaking the temporary truce, which began at 8am (6am UK time).
"Once again, Hamas and the terror organisations in Gaza have blatantly broken the cease-fire to which they committed, this time before the American Secretary of State and the UN Secretary General," Israeli Prime Minister Benjamin Netanyahu's office said.
Israel's ground forces were remaining in place during the truce and vowed to continue destroying cross-border tunnels they say the Hamas militant group uses to try to launch attacks.
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