The reunion was highly unexpected, but governments can form quickly in the Middle East. The West Bank and the Gaza Strip are back together for now, at least politically speaking. According to the AP:
Palestinian President Mahmoud Abbas swore in a national unity government Monday, formally ending a crippling seven-year split with his Islamic militant Hamas rivals but drawing Israeli threats of retaliation.
The formation of the unity government and Israel's tough response are part of a wider competition between Abbas and Israeli Prime Minister Benjamin Netanyahu for international support since the collapse of U.S.-led peace talks between them in April.