Israeli strikes in Gaza have killed at least 24 people, including 10 from the same family, after Hamas rejected a ceasefire proposal. The Palestinian militants' chief negotiator called for a comprehensive deal to end the 18-month-long war and urged international pressure to lift the blockade on Gaza. The United Nations has warned of worsening conditions and shortages of medicine and essentials for the 2.4 million people in Gaza. Israel has intensified its aerial bombardments and expanded ground operations since resuming its offensive on March 18.